Technically, games are tied to NNIDs on Wii U and 3DS (as of 7.0) as well. What's more useful is the fact that you can move a single Nintendo Account from a Switch to another without doing a full System Transfer or calling Nintendo. (Saves can't be transferred... yet.)Although the Switch doesn't have region lock and your games are finally tied to your NNID.
Still not quite as good as Steam allowing multiple systems to log in with the same account, but getting there.