Just having visited Japan, another thing that's immediately apparent though is that there are other well-intentioned laws that prevent this from happening. My favorite breakfast was like $8 (which was better than American breakfast by an order-of-magnitude) was in a tiny shop that had a tiny curved staircase that could scarcely fit tall people, definitely not obese people, and don't even pretend handicap people.

Frankly I think alternative laws should be applicable (you don't need to be able seat wheelchair people if you're willing to bring the food to them to-go) since I just think it's not worth losing that efficient density and cost-effectiveness for a tiny tiny fraction of the population.