I play with WM on because of more resources for doing so. I also did it for the xp increase, I hate that I q for M+ and cannot summon because someone else has WM off. our Guild runs are great we have 3 rules.
1. There are no Rules
2. WM has to be turned on
3. No Magic Dampner to prevent the swapblaster.
The 2-3 rules are encouraged, but rule #1 overrides them anyway.