Or they just limit PVP classes to non problematic classes. Soldier, vanilla human engineer etc. no biotics outside maybe warp, tech powers anything but AI mind control stuff. Personally I'd make 5ish totally separate pvp classes so there would be no bleed over into other modes.
And how would you explain those limitations logically? (in game)
I don't particularly like MP, I like PvP even less. The more the game deals in these areas, the more SP elements are going to be influenced by them.
So if you ask me, no, I don't want to see any of this.
Example for said influence: Destiny was made with PvP in mind, so their "space magic" powers are very limited, both in number and in long cool-down,
and most of them simply kill anyone affected with one shot. You can't really play there a real power-based class no matter which class you chose.
Even their "mage" class - Warlock, uses guns as much as their other classes.