Instance finder cold benefit froma few improvements:
-there is no way to put a search for a generic 12-man skirms or instances, you must form the raid first and later use the "specific" tab to launch the raid.
-we can not see what other players are looking for. not all players use LFF and not all servers have glff
Right now there is a demand for BG and skirmish 12-man raids and a lesser demand for 3-man erebor instances. When i have time to raid, i would happily do any of these, but a 12-man raid is a tedious process of invites and usually its just BG farming, even when there is a demand for skirmish drops.
And if i can see what other players are seraching, i could join instances that i need, but are so rare right now that most related deeds will remain open, like anumminas, fornost, most moria instances, draigoch, isengard and LLG.