I honestly wish they bring back Notorious Monsters. Hunts are similar but NMs are much better in a way.
Examples in FFXI and FFXIV 1.0, they give useful items or gear drops that can be relevant for raids or just good leveling gear instead of hunts giving out seals that can be traded for glamour, and Hunts gets shoved on Relic weapon stuff so people can bother doing it.

Other than that, I'm down with open world dungeons. The Aquapolis and Deep Dungeons seem like they are. They should also make open versions of the existing ones, too.