In Mists, (and even in Cata) my guild got away from using any loot distribution method other than /roll or need/greed. In 10-man raids, the itemization on gear made it suitable only for two or three specific specs, and as a group of mostly friends we never had any drama.
In Warlords of Draenor, with larger raids due to flexible raid scaling there is bound to be more conflict. Add to that thee revelation that gear will alter its stats based on the spec of the character that equips it. That means that a single leather piece can be rolled on by ALL druid specs, ALL monk specs, and any rogues. Depending on the secondary stats, a single plate drop could be rolled on by ALL paladin specs, ALL death knight specs, and ALL warrior specs.
Will this force us back to a loot distribution system? I was happy to be rid of that for the past two expansions. We used EPGP back in the day. Might have to reconsider it.