Please Don't Ever Add Entire World Level Scaling

[Gwenkatsu]

monsters in the open world of WoW scale with the players level, which means when ever you get a level up, the monsters become stronger because your gear become worse relative to your level.

Yeah I dont see a problem with that tho but idk what op didnt specify

Imagine you're level 90, and the next expansion comes out.
First you pull whatever you see, 5 mobs, 10 mobs, all the same.
Then you reach level 95. Suddenly, every mob has a boatload of HP, and hits like a truck. So you pull 2 mobs, and you're dead.
The scaling is also broken in a lot of places, AFAIK in certain game modes a level 10 does like 10 times the damage of a max level character. Imagine the fun when you (max level) get into a group with a level 10, who pulls the entire dungeon and survives (there are no walls in WoW dungeons).
This is one of the (many) reasons I finally left that dysfunctional game for good.