Title.
Dances with Demons works wonderfully in Sunqua Peak - if the party wipes, everyone's eligibility buff is reset and you get to try again fresh without hassle.
In Silent Surf, for some reason, the title eligibility requires restarting the whole instance, which means minutes of downtime between each pull since you also have to kill the miniboss before you get to attempt the real thing. The fight is very very long as is, and it is incredibly disheartening to wipe at 10% only to get to exit to say hi to Dessa and beat up the dummy boss.
The hassle involved in getting the title also creates incentive for heavy LFG gatekeeping - you will see 40k, 50k UFE requirements, infusion pings and fractal god titles partly because players really dislike the extra downtime. (And yes, everyone is allowed to make a group with whatever requirements but the clunkiness of the CM run underscores the gatekeeping issue).
Easy fix: make the title eligibility visible and reset every time the party wipes. Fast, elegant, simple and player-friendly.