I strongly suspect that the developers learned from the PTR and its feedback that there were concerns about how weak the new sets were for monks & crusader and the strength of the ww/rend build. They looked over their data and came to decision about the revised numbers on the items/sets.
The idea that the developers are actively trying to disenfranchise any one class seems incredibly unrealistic to me. Also, I can not imagine a scenario where the developers strictly relied on the feedback of a single forum user or one player’s GR clear. When I objectively looked at the data, I thought a reduction of the rend damage on lamentation to 100% was appropriate. Apparently, the developers with more comprehensive data analytics disagreed with my assessment and removed the rend damage bonus from lamentation entirely.
@Seiya,
Although the new forum does not have an integrated ignore function, you may find this thread helpful for a work-around.