I think this thread conflating between walkable and having good transit. A walkable city means almost everything you need is within walking distance. That doesn’t mean there are buses or trains to take you out of this area. I live in a walkable part of the city. Within a 15-minute walk, there are three supermarkets, perhaps twenty restaurants with different cuisines, four pharmacies, one each of USPS/UPS/FedEx for shipping, four different banks, three dry cleaners… you get the idea. The only transportation tool I need is my two legs.

Now of course sometimes I’m not content staying within this 15-minute circle. Then I simply choose the fastest method of transport to get there. Is BART or Muni faster than the Waymo trip? Then yes I’ll take pubic transportation. That’s what good transit is for.