Gunblades like the Garlean Empire uses
As Dragon especially the one Noel van Darnus used

roaming NMs, with drops that can be used for Vanity. Not Fates.

Open Dungeons like in 1.x with their own sets of leves that WAS fun

Bring back the stone golem in ... I think Totorak? And again multiple paths in Dungeons. That was fun in 1.x too