Earlier quoted context omitted.
Quite a few of the towns in the South Bay have walkable cores: Mountain View, Palo Alto, San Mateo... You also have smaller cities all over the country. Now, you get into truly small towns in places like New England and there really isn't a lot in the town center and it's unlikely you'll be living walking distance from it.
Come on, Mountain View’s downtown degrades into there-is-not-even-trees-to-shade-you after like two blocks sideways, and no grocery store. Palo Alto is better, but unless you live in downtown south you won’t be walking distance from a grocery store, and you can basically not walk for more than 20 minutes without being in boring ass McMansion suburbia.
I can't tell if you forgot about Ava's, or if you've never actually _been_ to downtown Mountain View, or if you only consider chain supermarkets to count.