Earlier quoted context omitted.
This is true, but that model of suburban development still tends to push necessities out of walking or even biking distance. I visited my folks in the Des Moines suburbs while they were out there and it was an hour's walk to almost anything bigger than a corner store. Of which I found, I think, one that was closer than that.
If we go by your parent's photos, my main beef with these neighborhoods is there's no commercial development. There should be (light) commercial development. I am a big fan of the Asian shophouse. You can open a restaurant or a convenience store or a small clinic or whatever class of local service business isn't going to be too disruptive on the bottom floor of your residential property. You need to own and operate i…
There is. (both example pictures above have a commercial development less than 10 minutes walk away).
The problem is that there isn't enough commercial need for every single development to have it's own commercial block -- we already have a large overabundance of commercial space in the US as it is, adding even more of it inside each residential development doesn't magically spring forth a business to fill it.
(this is true even at city-level densities -- as lots of urban 5-over-1 developments are struggling to keep their ground-level commercial/retail units sustainably filled)
And since we do need more housing, pressure builds to just convert the commercial back into residential anyway...