While I was waiting 54 minutes 35 seconds for a party to run Odin I was thinking of ideas that SE could add that would give people a reason to keep playing through old and newer content.

What would be great incentives and additions to the game are to add gear sets and weapons from the heroes and villains from previous FF games. SE wouldn't have to add all of them at once however, they could add 5 hero sets and 2 villain sets in one patch and add more as time goes on. The idea is adding, for example, Irvine Kinneas chest piece can drop off the last boss in Tam Tara and his legs can drop of the last boss in Wanderers Palace. All weapons can drop off different Primal bosses etc...
They could add certain vanity items to fates as well.

This is an idea that could breathe life back into older and newer content that people have zero reason to run anymore so they don't. I'd be one of the first ones out their farming some of the gear

It would be a win win for everyone.