I think a major driver of anti-single-family-home advocacy is simply that the kind of people who become urban planners are the kind of people who personally love the crush of the city and the close proximity of their fellow man. It is also fueled by the interests of developers and, to a lesser extent, social justice advocates.
When I was in high-school, I spent 2 weeks in the USA, on Long Island. I could walk for an hour and not walk across a pedestrian. There were often no sidewalk (when there were, I wasn't sure I could use them, as to my foreign eyes, being detached from the road, they where running though properties :-D ), but what's the problem with that? There was almost zero traffic, since the areas are low-density residential; much less than on my country roads. I could reach the ocean, I could reach playgrounds/playfields, I could reach one street with shops, I could reach... the high-school. No transit was needed. But I was alone in the streets/on the roads. I didn't understand why the older kid (16?) of the house was already driving a big car to go to high-school...
When I look at Google Maps, a huge proportion of those suburbs areas seem to be within a mile of a either a shop street or a supermarket, and often some playfield too (we don't have that many over here). The grid pattern makes access easier. So I am puzzled. It seems very 'walkable' to me. Of course accessing those supermarkets by foot or cycle ranges from unpleasant to maddening because access was generally only planned for cars. But that's much more easily fixable than redesigning the whole zones.
Now if you work 15 miles away, that's something else, but does this come into 'walkability' concept? No density is going to fix that: even in a big dense city, your job, or your next job (and even more your partner's!) is almost always going to end up on the other end of the city after some time. Walkability cannot help there, so I reckon jobs location shouldn't weight on the concept much.
I lived abroad in a pretty US-sprawl-like place. A huge majority of detached houses, a few rowhouses, a handful of short flats buildings, with supermarkets in place of the town centre. Basically no small shops, but a few bars between the supermarkets. I was living on one side of the town, and I was walking (winter) or cycling (summer) everyday to my workplace on the other side of the town, 2 rivers and 1.5 miles away. I would shop on the way back home. Easy, simple, practical. No transit is needed. For me it is walkable. But it seems it isn't, for many people I read here, because they would declare similar areas in the US as non-walkable.
I now live in a municipality, where density is 8 inhabitants / km² (20-25 inhabitants / sq mile). But most people live within half-a-mile of the village centre. It has enough small shops for your daily or weekly needs; if you wish, there's a bigger shop/small supermarket in the next village, 2 miles away. There's a guy who is over 80 years old and who lives at the farthest point in the municipality, 1 mile away. He comes shopping almost everyday, by foot, on the road that passes in front of my house. So for him I guess it is walkable. But what if we ask all the 40-something who live 4 times closer, but who prefer to take their car, and drive 2 times 10 miles to go a big supermarket. They'll swear they need their car, for those countrysides are not walkable! Heck, my neighbour works in the centre, that is one quarter miles away (5 mn walk, 1 mn bicycle) and takes her car to go to work.
Sometimes it is true. Imagine you wish something like the Spanish town model: a very dense centre, and nothing else than the centre, so wherever you are in the town, you just walk/cycle/drive less than a mile and you are in the fields, the hills, or other forms of 'nature'. Density located in a single point would also enable easy and efficient point-to-point public transit between similar towns, by the way.
Anyway, you can't have this if you take the French route and allow suburban sprawl. It will spread 5 miles around in all (free) directions. Then it doesn't matter if you densify the centre (following the mantra "density is good and efficient" which we hear all the time here), people living in the centre (and most of the suburb) will not have access to 'nature' unless they use a car.
(What actually happens in terms of densification in France is generally worse, because densification of the sprawl is not made in the US style with huge buildings in a very dense, punctual, centre, but it is made along some axes or in some areas here and there. You end up with some average density everywhere, while the infrastructure hasn't followed. And cannot follow, because the density itself is spread, instead of being in a single point easily served. The elected from those areas say they want to combat sprawl, but they make it worse for everyone this way.)
On the other hand, I agree that cities, or urbanism in general, shouldn't be designed for what I call the 14-28, like it is often asked on this site. Or at least it should be the only goal and it shouldn't be the goal everywhere. What I mean by 14-28 is people who are in a great demand of interactions, who want to meet people, a lot of people (of course it depends on individuals, I just arbitrarily peeked those figures). It has always been like that, teens and young adults have always wanted to leave and discover the world, to multiply experiences, good and bad ones, and are attracted by the city lights. That's something we must acknowledge, and we'd better provide an environment for that.
BUT that must not be the end of all things. When people get a bit older and become parents, most of them tone down and wish to be in less hectic areas, that's just a fact we can observe, even if it doesn't match our own ideal. And that's like it until their death, you can find a few people who will move to a city for their retirement but most who move will move the other way. Same for kids: until a certain age, they are satisfied with the presence of their parents, schools, and a handful of neighbouring kids, they have no need or desire of a large and dense city.
So most of their life, people don't care for having a big concentration of people where they live, and on the contrary favour a bit more space and a bit more quietness. Urbanism shouldn't blindly optimise for the former (density).
I think the environmental concerns that feed into it are often quite valid, spreading endless suburbs across places like the UK is not a great idea. But I don't think criticising those who aspire to have more space is a good outcome.
What I'm drawing attention to is that the bien pensant class in the UK seem to have started to tell us it's wrong to want the life that people have aspired to before. And that this is something we saw some decades before with brutalism, pushing people into spaces that designers and architects wanted them, not places they wanted to be themselves. There seems to be a desire amongst some architects and planners to push people towards their ideals of higher density housing, in particular, trading out much in the way of private space to much more social living.
Not everyone wants that. It's not wrong to want to live in smaller urban spaces with that trade-off, but it's not wrong not to buy into it either.
I sincerely hope remote work takes off so the geographic network effects of all the jobs being in the same place are less important. It would make low density much more viable for those of us who want to see the sky and maybe a tree every once in a while.
It is literally illegal to build apartments in many areas of the United States. That's because of local zoning laws limiting how many residential units are allowed per acre, minimum parking requirements, height restrictions, setback requirements, etc. The US government intervened in the mortgage market to make low interest 30 year loans broadly available (if a homeowner defaults and the foreclosure sale is not enough to cover the loan balance Fannie Mae & Freddie Mac are the investors holding the bag). Toll-free highways make commutes from suburbs to downtown possible.
Exactly. If someone wishes to own a detached single-unit residence, fine. I'd prefer they didn't but that's not my decision to make for an individual.
The problem comes when people want to control what's built within a quarter or half or full mile of the residence they own. (And, no, before someone comes at me with this specious reasoning, there's a huge difference between "build a nuclear power plant next to a daycare" and "different types of housing near each other.")
As a matter of public policy, I will always advocate that we do the environmental and financially efficient thing of building closer-in and closer-together. (We gotta add in some standards for noise transmission, too.) But preserving a specific type of housing in a specific location in amber forever is not reasonable and should not be continued.
[1] https://www.strongtowns.org/journal/2020/4/16/when-apartment...
I see this a lot in UK articles too, berating people for wanting a boring detached house and a garden somewhere quiet, when they could live in a shoebox in the city. It seems to be a bit of anti-middle-classism, mixed with environmental concerns and a love of central planning. Some of the same thinking that lead to brutalism here, IMHO.