I'm not convinced that mobile is a good platform for longer-term games.
want to spend 5-10 minutes waiting on the bus while flapping a bird or crushing some candy? makes sense to me.
Resident Evil? I'm not so sure.
On the other hand, Fortnite seems to work, so what do I know?

Anyway, I think Phones have become powerful enough that they should be able to get docked to a Desk/TV. Then it makes more sense to me again, a Phone could be the only computing device most people use