This fight feels close to an EX fight, actually. Yes, the mechanics aren't new but sometimes RNG screws you over like, "Hey, dodge my fist in the middle while my tail slams the few remaining tiles. Oh, and take a stack marker as well while everyone's busy surviving the rest."
A fight that hard shouldn't be in the MSQ. That's why EX and savage fights exist, to give the option of a harder fight to those who want a challenge or the "hardcore" elitists. Most people don't play MMO's 36hrs a day. Some won't even play on some weeks. The difficulty should be moderate so that all can advance the MSQ and THEN you can let the difficulty kick in in the optional content. Plus, SE locked the gear or even training for that fight behind that same very fight. That's a bit ridiculous.