This is just needless fearmongering, crit materia is king now, no one is demanding everyone meld crit or they're getting kicked. Healers and tanks require direct hit materia to even proc a direct hit, nobody is demanding that those roles meld direct hit or they're getting kicked. I've seen tanks with tenacity melds and healers with piety melds, nobody cared, we just clear the content and move on.
Literally nobody is in PF trying to micromanage someone's mitigation/heal usage despite there being an optimal solution. Literally no one is locking out RDM and SMN from PF despite BLM being the optimal caster. Kindly stop doing needless fearmongering.