None of this is that important to the overall game, though. You can turn Tetris into a turn-based puzzle game where you have an unlimited amount of time to pla

None of this is that important to the overall game, though. You can turn Tetris into a turn-based puzzle game where you have an unlimited amount of time to place each next piece, it just has to obey the same rules as having overhead clearance on it, and it's still the same game. This is effectively the game that AI players are playing anyway, since they think faster than the pieces fall and thus time is not a constraint for them.