Are you sure about that?
Personal Loot had bad luck protection while Group Loot does not - Community / General Discussion - World of Warcraft Forums
Obviously that doesn’t prove anything except I’m not alone in my thinking that it existed at one point. I mostly remember running a full LFR clear and generally getting at least one piece of gear vs. running for multiple months and getting nothing since personal loot went away.
I’m still 100% for need/greed for non-queued content. In fact, I wish they’d bring back master loot for full guild groups (and only full guild groups).