I would like to see more advanced jobs in the Hand and Land disciplines. Maybe less of an individual endeavor, and more along the lines of party crafting, since the adv jobs are focusing on party roles and not solo play.

Needing a party of crafters working together could be intriguing, and, as I understand it, was explored in XI already? I quit XI before they implemented that system, but a refined version would probably be welcome in Eorzea.