Can’t comment on the ACT because my kids only took the SAT - but on one round of tests omitting 2 on the Math section resulted in a 720! For omitting 2, for Pete’s sake! On a different day, one might easily miss none.
So while 800’s and 36’s sound impressive, I agree with the OP that there is probably little difference between those who score the 33’s and the 36’s (or on the SAT the 750’s and 800’s). Part of it is luck.
Probably, if you were tenacious and talented enough, you could get perfect scores or superscores, but kids shouldn’t be robots. Why return to your own vomit over and over for a perfect score?
Some may think it is worth it for bragging rights, but I personally do not - nor is it healthy!