I'm curious what you guys have to say about this. Are there any games you consider perfect? Can a game even be perfect?
My example of a perfect game is always Portal 1. Portal 2 has more going on, but in 1 there just isn't anything to shave off. From start to end, there is nothing I'd change about the game. It's short, infinitely replayable, great pacing. I like Portal 2 a lot in concept, in concept it should be a perfect sequel, but it just doesn't keep the extreme tightness of the original game.
Most roguelites are like that tbh, except some older ones like Nuclear Throne from the days before permanent progress got really integrated into the genre.
I personally don't really consider it a flaw so much as a shift, because once you hit that point you have the tools and more freedom to branch out and try less optimized builds because they're fun.