I actually went Brewmaster for our first kill of Will. Lawdy, that feels like forever ago, but you can literally soak every single spark and take almost no damage with Guard. We only had one DK at the time, so me and him tanked both of the strengths.
I guess with WW you can do the same thing with Zen Med and Diffuse Magic, but not every single one.
Granted, Will is just one of those fights we killed once and never want to do again. But we will to make sure all of our raiders have their Cutting Edge achievements, now that everything is on farm.
If your monk is the one in your signature, my only complaint with your quite a ways from 100% BiS setup are the tier items you are using
The difference between a MSV BiS-monk and a T14 BiS monk I've noticed are pretty high. I myself do a sustained 130K under normal circumstances, with maybe a 10-20K delta depending on fight mechanics and how procs align. Sure, our rogues burst at something like 300K, but - for example - on Lei Shi I beat every one of them, on Elegon I can easily top the melee, and let's not even get me started on the kinds of numbers our class can see in Vizier Zor'lok. We're sustained, and that's why I love this spec. Sure, we aren't bursty - but I think with proper TeB usage, in a DPS check fight such as Spine (or, arguably, Ambershaper - bursting down constructs), using our TeB stacks in conjunction with Energizing Brew and Synapse Springs makes us useful.
But try explaining that to a ranged-heavy raid that only sees the value in multi-dotters, cleaving, and people who burst 300-400K.