Originally Posted by
Kaitou D. Kid
The MHA and OPM universes aren't good examples. People with powers have existed in MHA for a loooooong time, and a majority of the population have them by now. The MU will never get to that point unless (somehow) the real world gets to that point. Beast's prediction about mutants outnumbering humans would have to happen in the MU before it looks anything like the world in MHA.
As for One-Punch Man, if anything it proves Spider-Man's point. Most of the S-Rank and A-Rank heroes in that world are there due to vanity. Saitama doesn't have the rank deserves because he actually wants to be a hero and doesn't care about his reputation.