I will just say that I don’t think Steam et al. are equivalent to logging onto your device. The account I use on my computer is… just that, a local account for my computer. So, if the Quest requires some sort of authentication, why can’t it be local too?
I have the same argument with consoles as well, but at least with the Xbox One, login still isn’t required unless you’re playing digital games. You can play all the disc games you like without any account.