I think that this post is as spot on as can be. All monk healers that I speak with complain about the amount of absolute RNG involved with the mistweaver. Hell, some priests already complain about PoM randomness, compare that to MW's. The main problem with MW is not the amount of healing done, but the (core) mechanics that are flawed. The amount of RNG involved (ReM, chi generation, tea's, our Mastery, etc.), and the dependance on spells that stand or fall based on RNG (uplift, chi explosion).
Currently a MW can be absolutely awesome on one fight and do nearly no healing on the other, simply becase the RNG-gods chose to smite the MW that particular fight. That is not what the average healer wants, and its not something that massive throughput can mediate.