For ages I've really wanted them to add proper hard modes for dungeons with a difficulty level akin to the stuff you encounter in the exploratory zones.

Higher difficulty that is not overly reliant on body checks and precise positioning like what Criterion offered would be the optimal middle ground to me IMO. Something that is easy enough to jump into without reading guides, but still difficult enough to require you to have your brain turned on and make full use of your job's kit.