So I have run various sims on heavy aoe cleave fights and have done some log analysis of some of the top monk parces for BRF. It appears that currently, all monks parcing well into the top ten on most fights are walking around with a decent amount of haste 750++. Obviously haste is king for multi target fights/chi-ex however the question I have is how much haste is comfortable for chi-ex playstyle with the increased amount of SCK usage in BRF.
Personally I have about 300 haste and have noticed a significant difference from week to week when replacing some of my Highmaul haste gesr with BFK multi gear. I know the general response is "just sim it" and I do however is as looking to generate some discussion in the community about success and failures with balancing aoe gesr setups.
The monks walking around with tons of haste likely just still have it from Higmaul where it was plentiful. When using CX you simply want as much haste as you can get, specially with using SCK/RJW.