I can't remember a console that required memory cards to play games fully.
Vita, as mentioned. And every system requires some type of storage to play. Other systems are just better than Switch when it comes to internal storage. But if you fill that up, you can't play any new games until you either delete something or add more storage.
That's not what this is referring to. You literally cannot play the full game at all without a memory card. Has NOTHING to do with running out of space.
Yes it does.
You need a memory card only because the Switch does not have enough internal storage for the downloads/install. It's not a case of some kind of "This HAS to have a memory card and can't use internal storage" case. It's just that the Switch doesn't have enough storage normally. It's the exact same case as "running out of space," except it's because the Switch never had enough space to begin with. The games in question are too big. If the Switch came with like, 500gb like it should've, there'd be no memory card required.
I am really concerned that you are either just trying to argue to argue or are trying to say something I am saying the same in another way to try and be right. ---