I live in a 15-minute city location and it's absolutely brilliant.
Within 15 minutes walk I have easy access to:
Multiple cafes, bars, pubs, restaurants.
Multiple hairdressers, salons, barbers etc.
Many, many shops.
Several gyms.
Cinema.
Two swimming pools.
My oldest's high school is literally across the road. My youngest's school is slightly further, probably 12 minutes walk.
My GP, gynaecologist, dentist, optician - all within 10 minutes walk.
Trauma centre: when my youngest fell and broke his arm on the way home from school, he was in the trauma centre and being treated straight away. We walked there, and walked home afterwards.
Hospital - DH is having an operation in a couple of weeks: he'll walk there, and probably walk home a few days later
Veterinary surgery.
Small supermarket and two different fresh produce markets, and loads of bakers / grocers / 'metro' type supermarkets.
Huge park, including a zoo and botanical garden.
Four smaller parks with play equipment and outdoor gyms - one literally across the road.
Bus stops, underground stops and the main city railway station is (just) within 15 minutes walk.
The 'price' I pay for this:
We live in an apartment, not a house.
We don't have off street parking (we do still have a car for holidays / weekend trips / trips to IKEA for big items) but we do have resident parking - it's never been a problem to get parked.
For work, DH and I both cycle - 25 minutes each way. It's a great way to build exercise into the daily routine. Our apartment building has a secure bike storage room in it.
So as not to drip feed; we don't live in the UK, we live in France. We aren't huge earners - DH is a teacher, I work in administration in a school. We are definitely in a 'naice' area, but it's not super-wealthy at all.
I can't understand why Rishi Sunak would actively campaign against making essential services easily accessible to people living in cities.