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Yeah, some people still haven't learned how to play it properly :D. But that doesn't stop them from prioritizing the fourth installment. So, indeed, that's not the issue here. It's a matter of taste and perception. This topic really highlights that.
I completely understand those who encountered the fourth game for the first time after being enamored with the third, gave up on it then, and now, with the fifth game available, won't even bother learning the fourth game's system. Why would someone who never really "got" the fourth game "delve" into it now, when there's a fifth game they can immerse themselves in and keep playing for a long time, learning and improving? We have to admit that the number of fourth game fans that exists now will remain the same (if not decrease, although true fans of the fourth game will never get tired of it): those who didn't have time to "get into" it back then won't bother with it now – there's the fifth game, a whole new world to explore. So, in conclusion, I'll say that there are few of us (fourth game fans), but with our strategic thinking (if we managed to master the fourth game), we can handle any installment.))