From what I understand, not only is the drop rate low but the chances of getting one are slim enough as it is, never mind getting the perfect roll on one when it comes to stats. So RNG on top of grinds on top of more RNG. All this sounds like to me is the games way of passing time and giving the players who already worked for everything and have nothing else to really accomplish in the current game something else to try and obtain. It sounds like a final "busy work" content before the expansion comes.