The high jump seems to be more deliberately a test of physical skill? Did the designers of Tetris set out to make a game that measures the rate at which you can push a button? A lot of games have no glitch speedrun categories.
If the designers wanted the game to end at level 29 they could have forced the game to end there. They didn't, instead programming a game that allows users to get continue indefinitely even if the designers themselves were unable to pass level 29.
Sure you could make a no hypertapping or rolling category for Tetris. Calling better techniques a glitch seems wrong, though speed runners often disagree on what exactly constitutes a "glitch" anyway.
