Living in Europe this question doesn't compute at all. Such a foreign idea to even contemplate. If it doesn't have a sidewalk, it must be a country road or a highway right? Couldn't happen in a reasonably densely populated area...?
https://en.wikipedia.org/wiki/Stroad
USA seems to be unique in the case that they think this design constitutes a finished product.
Edit: the Not Just Bikes youtube channel has great content regarding contemporary urban planning. Here's their video about stroads https://www.youtube.com/watch?v=ORzNZUeUHAM
That said, the purpose of said sidewalks is to exercise your dog, or let your kids ride their bikes around. They often don't connect up to anything in a useful way (other than nearby parks and maybe elementary schools - but only if they are very close)
What should it connect to? Thanks to zoning there is no Café you can go to or a small supermarket or anything else in the vicinity. Not even public transport which then might bring you elsewhere.
If they could get away with it developers would drop sidewalks completely. It’s only because cities and towns started mandating it that they became fashionable again.
Which was considered fine at the time and depending on where you live is still fine.
Or in many of the places, the sidewalks exist, but are useless because cars are allowed to park on them.
I've never understood how people in wheelchairs are able to get anywhere in most of "civilized" Europe.
There is a little wedge of Washington, DC, bounded by Oregon Avenue, Western Avenue, and Chestnut St, called "Hawthorne". I used to run through and see signs reading "No Sidewalks in Hawthorne", after a while varied by signs says "Yes, Sidewalks in Hawthorne", but probably fewer. I suppose that this is six miles from the White House by air line, probably seven by road.
(And now there are sidewalks in Hawthorne, at least a few.)
When the Feds someday allocate billions to bike infrastructure, they’ll get the sidewalks, etc.
Imo securing rights of way that can be a framework for a future system is key.
I was a pedestrian cyclist there from 2017-2020 and I frequently was walking or riding in the roads or ditches when the sidewalk ran out. Sure, I could get across town, but when I get there, who knows if there's sidewalks?
If I wanted to go grocery shopping and be on a sidewalk/bike trail, I had to go an extra mile out of my way to go under the overpass and through the community college to get to neighborhood market. That trip was already a mile if I rode along the road, so double the distance. That's not making cycling a first class citizen! That's hiding cyclists from cars who are the real first class citizen. I know, I grew up there.
Fayetteville and Rogers get this right(ish), Bentonville wants to pretend they have it right so talent will move there for Walmart after Walmart spent decades making sure brain drain was inevitable by keeping the area "small town" (they bragged about this during my corporate orientation) and fighting density that could have naturally precipitated good pedestrian and biking infrastructure.
And the separate bike lanes through the woods are not some grand way to make cycling first class they are NECESSARY or the rural drivers who come into the "city" would be playing chicken games and trying to run cyclists off the road. When I grew up this was a common thing to joke about!