Ultimately, if you want to be in the 1st violin section of a symphony, a jockey in the Kentucky Derby, a lineman in the NFL, an adjunct teaching modern languages at a community college, or a teller making change at a bank, then there are going to be objective performance standards that leave a lot of folks out of the running.
None of that stuff is life or death. We tolerate crushing physical standards in our games and our music entertainment, but have no use for keeping up standards where people could actually die and shit?
I'll go back to my lane now (again...)