My UK house:
There is one bus that comes once on a Friday. It goes only to the nearest town (3 miles away). Hilariously that bus doesn't return so anyone using to can't come back on it. And there are no other buses serving my village.
The nearest train station is a 20 minute DRIVE away. It would take me approximately 3 hours to get the train to work from the station *if* those trains actually ran 3 hours before my work started. They don't.
So I would need to either walk 3 miles (4 days a week), then get multiple connecting buses to get a train to travel 3 hours to then walk several more miles to my employer and/or more buses. And convince my employer to let me start work at 11am (if I leave at 7am) and not expect to get home before... 10/11pm (but actually some of those services would not be running at that time of night either!).
I would need a season ticket for the trains, a Tube ticket covering multiple zones, plus bus journey costs and/or a lot of shoe leather.
Or, I can get in a car, drive for 30 minutes, and get straight from door to door.
Car-free lifestyles are great if you are prepared to live and work close together in a single major city, where cars are basically a burden anyway (i.e. parking, etc.) and are being paid far more than the average by doing so such that you can afford to do so (I know I can't afford to live in London any more, and have to have "London suburb wages" paying "rural-level housing costs"!).
Everywhere else they're a terrible idea.
Sure, they could lay on more buses, trains, things going my way, I could work locally (and take a MASSIVE hit on salary) or move close to work (and require FAR MORE salary to do so, I literally cannot afford to live near where I work!), but it would require countless billions in investment to even make it *viable* let alone my first choice (and as someone who used to live in London, I can tell you that public transport will never be my first choice, all else being equal).
Fact is, your car-free lifestyle literally isn't even vaguely viable for everyone, let alone their preference.
My nearest supermarket (that's not a corner shop) is 25 minutes drive away. My village's ONLY facility is a small, very expensive, farm shop that's only open during the working day, M-F, basically.
A lot needs to change, at all kinds of levels, and with all kinds of expense, before I can even consider abandoning my vehicle.