TAS can often be used as proof of concepts on upper bounds of what's possible / fastest

Things can often start TAS only & then progress makes it possible for human execution, like OOT Max Child% guay hover: https://www.youtube.com/watch?v=ULodSWYC8TI (which then is executed in the actual run 4 hours into 5 & a half hour run: https://youtu.be/NyCklbB0ok0?t=15034)

Route's will often first be shown with LOTAD (low optimization tool assisted demo), before others start trying to execute it in RTA conditions