That bit of detail added in your last post and OP edit changes your story/thread goals significantly. Not trying to jump to conclusions, as much as internet skepticism (you know what I mean here).

In that case, I can't say I've seen dungeon botters, but I'd bet it's people being on autopilot, where you put on Netflix, mash 1,2,3, and just hit the tank's target. Once you run a dungeon enough, ya get lazy.