I didn’t enjoy the capstone dungeons. I don’t like the fixed difficulty. Due to the incredibly fast leveling and not paying attention, I ended up doing the first 3 of them overleveled, and it was 3 times an unchallenging bore fest that went on and on and on and on (and on and on) forever.
If they absolutely have to be like this, at least add a priority quest with a very visible notification that keeps bugging you until you do them.