Utsu was actually a really cool concept in my opinion. Coupled with XI's battle system, it took some difficulty and mastery to be good at it, but I'm pretty sure utsu was an immensely popular skill for subbing, so I wouldn't say it made the game broke or problematic. Only bish was the quest. YES, utsu should make a return, there's a lot more to xiv that can make it a different mechanic.