"Oh hey, I used a glitch and skipped 82% of the game, including all of the most challenging bosses."
The Nier speed runs like to flag as "any ending" when the story is liniar progression and the first two "endings" are really just part 1 and part 2... So they don't even skip 82% of the game, just skip like 25, stop after around the 40% mark, then call it beat lol.
I don't see how speed runs are enjoyable. For me the whole point of a game is to be relaxing... It's like speeding in a car it is stressful.
I can understand people finding it enjoyable, some people like dissecting and all it's glitches and bugs. I personally find challenge type runs more far more fun to do or impressive to see other people do though.
Edit: the Nier thing would be comparable to a FF7 speed run that was called complete when Aerith/Aeris dies