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At least give reasoning if you're going to say that, otherwise they're just going to blow it off on nostalgia even though it seems like zoomers are the only ones thinking they were any worse than what came after.
You're absolutely right, though. You could take any other Pokemon game and put it in XY's engine and it would be phenomenal. You do the same for Gen 7 and 8 and they would be butchered beyond repair.