Why:It is incredibly overpowered.
How: because the 40% off hand penalty has no reduction on Monkchers and Centred 2HF - which need no help. 100 PRR in pyjamas is easily attainable while in full DPS mode.
This needs to be removed/neutered sooner rather than later before everyone builds for it and is nerfed when you realize your mistake. It kills build diversity. Anyone that says otherwise does not understand the mechanics of this game.