"Two or three files" can also be a terrible idea if a project mushrooms. Nobody wants to wade around 2000 loc files just because its missing tooling, but I can def see your argument.
Maybe not. I don't mind, I have incremental search. For me, wading around 200 files in subdirectories is more tedious. But it seems to be a matter of preference.
We have 1 file per react component, and keep our files down to < 200 loc (and we're still using es5). As long as you define your components before mounting any of them, you don't have to worry too much about dependency order.
