I'm glad you asked that question. It is precisely the mechanics and the DDR response required to "solve" them that trips up people. Indeed the fact that NPCs can clear it with the player doing no damage -- true in many if not all MSQ dungeons -- shows how terrible the current design is. If a DPS doing 0 damage can clear by putting their feet in the right place, the design is rubbish, but can still be difficult.
That said, I don't think this dungeon is a particularly good example of a difficult DT dungeon. To me Origenics is far more of a challenge. Yuwey is borderline comical with NPCs, particularly on the last boss where they run around in circles like the outro of a Benny Hill episode.