It might sound unintuitive, but making things harder at the baseline in MMOs doesn't actually get rid of people who don't know how to play their class all that well, historically. It doesn't even really gate them very much, because there's always ways to slip through the cracks and get carried or get lucky or just plain bash your head into it until it somehow works. You can go all in on systems like mythic+, but people still find ways to game scores and sneak through there too, and you get a whole heaping serving of fractal toxicity along with it.

Basic competency testing for boosters, sure, that makes sense. Beyond that? Lot of babies in that bathwater - be careful what you're throwing out.