I've stopped doing M raids (or any raid for that matter) in Legion when the M+ picked up steam, so my judgement on raids is limited if non-existent.
But, Holy in M+ sucks so bad it's not even funny. My main Hpally since TBC is rotting in alt-limbo since the start of BfA and I just can't with it's clunky ass mechanics.
I think there is probably 1 Holy Paladin in Top 300 on RIO, and I'm not about to subject me or my group mates to the horror that is trying to heal up necrotic on 15+ or higher. HPS outside of CDs is low, tank healing, of all things, is shit.
Yeah, I think we need a rework. Yesterday.