They don’t. My local shop has a waiting room with coffee, sodas, Wi-Fi, and seating/desks. Plenty of people (myself included) bring their work with them to the shop while their car is fixed. Also I’ve definitely seen people driving around loaner vehicles from dealerships before which is kinda a solution?
But you’re right that it sucks that our society has designed places where it’s impossible to get around without a car. My car shop is a short bus ride from my house or a slightly longer walk. If I take my car to the dealership, which is farther away, home is a bike ride away or I can go to the shops nearby. I’d guess this is the case in most denser urban areas except maybe some US cities which are just terribly laid out.
Highly recommend IGNEA if you like melodic metal. A few faves:
Jinnslammer https://www.youtube.com/watch?v=ZF_qqeXzM4g
Disenchantment https://www.youtube.com/watch?v=NnV9vpEit6E
Mermaids https://www.youtube.com/watch?v=YU9WFEwsQQw
But gosh their stuff is just all awesome.