Pretty much this. As instances, they are far too dull, far too long. They chaos of the endless fighting means I missed most of the dialogue. I have no idea what story has been imparted here. I couldn't tell you a single thing of value or impact to the story that has been imparted here. Maybe none has?
My partner and I played through the first two DRM's to get through the story but were so fed up by the end that we took a break from the story. Didn't touch it again for days, choosing instead to do map clearance and other stuff. The support currency nonsense was just pitiful, the rewards dreadful, the crystal bloom box was a waste. Didn't spend enough to get the tier rewards, not least because I had absolutely no desire to slog through the DRM's any further.
I finally forced myself to do the third part and was so glad for it to be over that I just left the map immediately, forgetting that there's a mastery to find. The really sad thing is, DRMs are such an unrewarding chore that replaying to get the mastery, just isn't worth the time and effort.
At least if these were side stories, I could wait for the first events to be done and then join in at the end or just skip them all together.