Your assumption that wage should align to productivity is false. It’s pretty hard to justify some athlete and artist wages this way, you have to really stretch what it means to be “productive”

Wage aligns with replaceability - how easy is it to replace you? Professional athletes are hard to replace, doctors less so, cashiers even less.

Wages are driving down because, unless you get lucky, there’s not much to do. Big companies chop up specialized roles into a hundred “dumb” ones so people can be easily replaced.