there are waaay less cars than people in tokyo.

most people do everything via public transport and/or bicycle.

https://stats-japan.com/t/kiji/10786

i mean none of the supermarkets close to my home have parkings... (they have a bunch of bike racks though).

there is 1 combini with a small ~6 spots parking that sits mostly empty. my building has more units than parking spots, there are a lot of bikes though.

in tokyo, having a car is not the default, you need a good reason.

now if you get out of tokyo (like gunma), it's another story, in japan they talk about "car society" (kuruma shakai). you'll see lots of cars, and big parkings.