I mean yeah that is to be expected. Ofc having a skin that can change into like 5-6 different skins in game is a bit much, especially for like updating visual effects in the future and stuff. So much potential for bugs.
I feel like Aphelios could def get something worthy of a legendary skin though. Could fix some visual clarity problems by making his skin change more drastically based on gun, which already changes his model/animations. The man is already a pain to make a skin for, and actually has an excuse to have something similar to the changing skins with him.
Didn't they just do the Thresh turning human thing though? Why can't they do that with a Legendary skin for a new champion?