I don't really feel like faction champs is "think outside the box"... It's pvp but with npcs, it is already in the game, it was basically just a giant add fight. CC adds, kill priority.
Rhyolith is a completely new mechanic, but it doesn't require any real though... Just dps left or right leg, most groups would just take it around in a rough circle.
Unique does not equal "thinking outside the box". Rhyolith really was pretty dull, faction champs was frustrating because you'd occasionally get insta gimped by bad luck and not every raid group is super organised and keeps everything controlled. Picture a slightly unorganised raid group trying to kill a fight where control is needed above all else? All faction champs boiled down to with most groups was "burn the crap out of one of the healers, CC the other as much as possible", you getting trucked on by a warrior was just an annoyance that you dealt with by popping barkskin and continuing to heal/pew pew.