[dotcoma]

Walking a mile should take 15-20 minutes.

If the streets are very busy, the pollution bad, the tunnels smell like piss etc, then that is the problem.

Small amounts of moderate exercise every day are a lot better than going to the gym (by car, usually) for a hard workout.

I’d rather read a book on the sofa, but you can’t walk while sitting on the sofa.

[gs17]

I don't see how it's a "feature" if it only makes it pleasant if you're fully able-bodied, the weather is nice, there's no traffic, etc. People want to be able to get places. Having to add an hour to every trip because transit isn't near you is not a benefit.