Imagine if all xmog restrictions were released and anyone could use any Legion artifact on any class, like a priest running around with the warrior 2hander, or a warrior somehow dual wielding 2 wand mogs. Now imagine a paladin using a bow mog to melee things to death, or a DH dual wielding melee crossbows.
What about a rogue dual wielding shield mogs in place of their melee weapons? The possibilities are endless, haha.