I was really confused by this because I've spent about 6 months of my life in Tokyo and got very very very few disposable chopsticks at restaurants a tier above, like, shokken ramen shops.
But the internet informs me that the composite chopsticks that I am used to seeing went away during covid and now disposable wooden chopsticks are the norm.
I don't exactly know the system for which restaurants pull out of the disposable chopsticks but I think that for example "normal" tempura, katsudon, or like soba restaurants will tend to be those.
I almost associate the cheapo reusable plastic chopsticks with some food courts or Matsuya at this point.