But eventually people will farm all the titles or other cosmetics up for grabs, and then we're back to square one, right?

Well, there is another way of thinking about this. If we allow parties to set their sync level to whatever they want, how low can they feasibly go? What iLv do you think your static can clear FCOB at? 115? 110? What about leaderboards for every server, showing off who has the lowest iLv clear for each dungeon in the game? Different statics competing to see who can push the next iLv down, who can get the lowest iLv clear on the server. If you incentivise it right and offer rewards, I'm sure people would be interested. And who says it's limited to endgame content? What's the lowest level you think you can clear Sastasha at? 6? 4?

Well my ideas spiralled out of control at the end there. Ultimately the basis behind my idea is players being able to create new challenges for themselves from existing assets. What do you think?