There are DPS checks in many of the dungeons it's just that the 4-mans are lagging about 25 ilevels behind the average endgamer so unless the DPS are phenomenally crappy or the whole group is at minimum entry ilevel you don't realize they're checks. Final boss of Haukke HM is a DPS check that becomes painful with two fresh DPS. Diabolos is one as well. Final Tam HM as well. Had a MNK check out during that one and we wiped to Red Wedding because we couldn't keep up with the adds.