Sad stuff, the collapse of the public realm. Compound living is the only thing we can manage still.
The discussion is about suburbs, so by definition it is away from the city core.
Here in our (US, California) suburb it is wonderfully walkable for kids and adults alike. For kids, there is very little traffic since only local neighborhood traffic is present unlike in cities. There are bike/walk trails around and across. Multiple playgrounds, sports fields, all connected by bike trails. Stores, restaurants, school, assorted services, theaters, all within a ~10 minute walk radius. This is what suburb means to me.
Where are these magical subdivisions with city-like access to amenities?
If you are really interested in this type of living, look for newer master planned communities in the south. They are immensely popular and aforadable compared to coastal cities.
There’s decent choice when house shopping, at least the places I’ve lived. If someone chooses a suburb surrounded by 2 miles of other suburbs, that’s their choice. There’s plenty of “old city” suburbs (what used to be the edge of town 25 years or 50 years back) that now have sidewalks and stuff nearby. HN trends wealthy though, so I imagine many people only look at housing on the current city edges.
That's how it's like in the suburbs. There are very few cars, and kids can play and bike on the roads, and go anywhere on their bikes.
It's only urban areas that are very car centric and kids can't do that, although they can go on the subway or a bus. The suburbs are much nicer and safer for kids.