I agree that it’s bizarre to agitate for a definition that explicitly outlaws mules, given the dearth of uppity dressage mules on the scene.
H&H naturally compared this to recent mule-related goings on in British Dressage, but it sounds like the definition change would apply to all of FEI so perhaps it’s driven by mules in other disciplines (driving? endurance? I’m too out of touch with some sports to know if there’s a hot mule rising in the ranks right now).
Another possibility is that the BD mule acceptance drew attention to the fact that FEI definitions currently allow mules, and some faction of Italian pedants decided they couldn’t let that stand. When Carl Hester starts applauding the advancement of mules, perhaps it riles some purists?
I hope this won’t have ripple effects for the folks who are working with mules at lower levels outside of Italy (e.g. Wallace the mule in UK). It would be quite a jerk move to agitate for a regulation change that would serve mostly to crush the ambitions of lower level pairs in other countries.