Maybe I'm alone here, but I don't mind the fist stances in general.

Some are less useful now than they were in Heavensward, but I still like to use them. I often will use Fists of Earth when raid-wide damage goes out, or if I'm targeted to take damage. In Heavensward this was especially useful if you ended up with brink of death to help you live through mechanics once your HP was massively penalized. Fists of Wind was also pretty handy while learning fights that required movement. Sophia EX comes to mind as a fight I regularly used all three stances. Sure they're niche skills, but they're not bad.

Considering Riddle of Earth is currently designed around you taking damage to refresh greased lightning, I wouldn't mind that staying as-is. But an overhaul to fists of wind would be welcomed, and I've suggested similar ideas myself. I think the added complexity would be welcomed considering how simplistic monk is compared to the other three melee jobs. The only learning hurdle to the job is learning your positionals. But, by level 70, you should be well past that and adding something else in would be welcomed.