imo it can easily be prevented : stop doing only 8 person hardmode content. start doing 24 person hardmode content and problem is gone. like most mmos do it. otherwise some classes will just never see some bosses in the future. you can already except to see nothing but dark knights on the tank spot once the xpac hits. tough if darkknight stays there compared to pal and war depends on how OP they will be compared to those 2 in the end. imo its better to have a spot for every class on a endgame raid. and while this wont work for primals maybe itll work since coil is now finished there is no reason to not start releasing future coil like dungeons on 24 person format. would also open up the raiding world for more players which is always good.