Agreed. For class diversity in 4 man push groups, the need for support is limiting class diversity. Over the past 6 seasons, the 4 man meta has been set to 2 zDPS (monk and barb), wizard, and necromancer. Needless to say, for those who main the other classes (Crusaders, demon hunters and witch doctors), it is more difficult to level legendary gems.
How would you nerf “healer monks” so that it would have little effect on solo play but limit their utility as zDPS? For barbs, it would be a nerf to “mob Rule”.
As a corollary to this, we need more DPS options. I saw this in another psot and it is relevant.