You said you understand why these are only affecting self, but you don't seem to actually understand what that means.
*Every* power in the game would need a new animation for the 3 fly powers. Since the devs have repeatedly said that animations are the hardest thing for them to make, I just don't see that happening.
Additionally, in the unlikely event that they did make 3 new animations for every power in the game, they'd likely take away the permanent status of those fly powers.