For what it's worth, I don't recall the Nintendo Switch ever giving me such trouble. Creating local accounts and playing offline has been smooth for me. But I never tried Minecraft on it.
We don’t know much of anything about that console yet and how Minecraft would work on it though.
More promising in terms of the old-school "plug in and play" experience is Evercade, who can get away with it because their titles are mainly licensed, emulated retro games that aren't changing any time soon.