It’s not even min max for dmg as it is for utility as well.
Lets take an UH DK as an example who likes playing arenas more than anything. If you’re fighting a melee heavy team and are expecting to take a lot of dmg you will want Kyrian, VS ranged that can kite you Necrolord would be a godsend…but wait! You’re best friend just said he’s coming back to play Shadowlands and can’t wait to run mythic + where Night Fae is going to be required. If I was a tank and an UH DK wanted to come it would be Night Fae or no invite.
I can’t wait to see the dungeon listings requiring specific covenants and forum posts of people complaining they are being declined from randoms because they picked the wrong covenant and the requirements to switch are too hard. We’ll have people quitting the game just like they did over RNG legion legendary items and Azerite armor just basically existing.