Every android tablet I tried essentially has performance problems and uninteresting apps. Phone doesn't have this problem because I never game on my phone, I'd rather read a book. Given this, I suspect the problem might be related to tablets being more "leisure devices", basically a game console. Now, a game console that doesn't perform and doesn't have good games ends up in one place: the closet.

Steam deck might replace all usages of a tablet from my perspective (and Apple should be more concerned about them).

iPad it's not laggy and has good games, so that serves a purpose.