Honestly I think the entire combat system needs changed up.. Damage from a single pull monster group should be high enough that if a DPS pulls ahead of the tank they shouldn't survive.. if a Tank Sprints off an leaves their healer they shouldn't survive long.. a wall to wall pull should be something possible with excellent use of mitigation an heals.. not just 1 MIT tossed out an a single regen..

It's just really getting sad that the roles don't matter anymore.. there needs to be actual thought into how you'll clear a pack of mobs and a boss not just watching YouTube and pressing 123 or 1 infinitely in healers case...