Are 15-minute cities a good idea? Yes and No. It would be convenient if every part of a city had everything you needed. But ultimately, people in power will use it as a control mechanism.
Get everyone to use transit, and you can control their movements.
Have everyone live in buildings without land, and you control their food supply.
Get everyone to go cashless, and you control their access to money.
I could be wrong, but the man’s chickens in the video below have everything they need, and he makes a good point.