Further, it's worth keeping in mind that it took an exorbitant amount of time to 'refine' exploratory content, arguably nigh on 2 expansions worth. A lot of people forget just how barebones Anemos, Pagos and Pyros were in the grand scheme of things.
This is to say, that I think content such as Criterion Dungeon and Island Sanctuary should be given as much time to refine itself, as to what we effectively gave other areas of content.
That said, and to conclude, I think they should be looking to deviate from their comfort zone, not stick within it.