I feel like SE should find a way to incentivize this feature - it could add a big list of things of varying difficulties for people to tackle. Random ideas:

(A) A large XP bonus of varying size at the end of sync'd runs. People could use them as a way to break up the leveling repetition of spamming the same dungeons / FATEs on repeat.

(B) Reward a full loot drop set of your choice (for glamours) in exchange for completing the related duties. i.e. if you complete the three 2.3 dungeons at sync, you get the Divine set of your choosing without needing to farm the drops.

(C) Add (yet another) token system, getting tokens for sync'd clears depending on the content, and make them exchangeable for new sets of relevant but not-top gear, say i190 in the current case.

Regardless, though SE would need to make sure things are actually doable (i.e. Haukke HM might not be?). Would any of the above make it "worthwhile" enough for people to have more interest in these?