For thousands of years humans have lived in "15 min villages" where almost everything has been nearby.

And most 15 min city definitions I've seen includes some sort of bike option.

I encourage everyone who lives in a city (or suburb) to look up routes from their home to groceries/pharmacies/schools/etc on google maps. I just did for myself and I'm already in a 15 minute city.

What's lacking is the infrastructure for people to safely get to these places without a car.