The Duty Finder works nice and all for most cases, but I think the fixed group composition can be an issue for a few specific battles, the most obvious of them all being hardmode Titan.

Thing is, not all content require 2 tanks or 2 healers, even for PUGs. You don't really need an extra healer for Cape Westwind or Castrum, and the last thing you need for the heart DPS race on HM Titan is two tanks. I'm pretty sure later content will also have examples where the 2/2/4 party is far from optmal, like the King Moogle battle (who ever ran that with 2 tanks?)

I believe the Duty Finder could be improved by allowing slightly different party compositions instead of "gimping" a group that's already "gimped" by the fact no one knows each other.

(Yes, I know, server shouts, do content exclusively with FC, etc. Just trying to improve a feature that's already there and people use.)