Correct me if I'm wrong, but in Stormblood using Riddle of Fire and Riddle of Earth would force you in to their respective Fist stance though that has since been changed in ShB. The Fists also had unique Shoulder Charge effects which was also changed, so it begs the question in the current iteration is there any need in the stances or at least could one be removed or upgraded at later levels to something else (Fists of Earth)? Like the fists could be kept but they could be built in to current actions or one or two be changed in to traits. We keep Fists of Fire active most of the time, switching to Fists of Wind once GL4 is unlocked (and that if a little OP as well but not sure how to adjust it if it should be).