Actually, OP is right. Gender Changes does have an impact in PvP and PvE, look at Male Taurens for example who literally have increased melee range. Look at Undead/Gnome female who gets stuck on certain terrains such as Ruins tombs in arena.
People posting on this thread are clueless and to answer your question, OP… The “REAL” only reason they’re adding Gender Changes is due to the fact that they’re trying to push the Gender Fluidity agenda, nothing else. So they get to nitpick non sense changes that benefit their fallacy.