Skins should never give an advantage
So I played vs a Yasuo the other day which had this nice Project skin and I noticed his 3rd Q buff sound was very muffled and barely noticable compared to his default skin. I actually use the sound to properly respect Yasuo's damage potential if he hits it but with this skin I could hardly hear it at all. Thus giving this skin a noticable advantage over his other skins.
https://youtu.be/gktWDVAC6cI?t=1m53s
I also noticed this with Arcade Sona skin and her DJ skin, her ult sound is barely noticable because it sounds muffled compared to her other skins. In teamfights I often wonder why I can't move etc. Again giving this skin an unfair advantage over other skins
https://youtu.be/8UUD5mZ_f_k?t=1m13s
https://youtu.be/GGBDz927TZ4?t=3m23s
I'm sure other skins have issues but these were the most noticable to me. I remember Steel Legion Lux having her E spell barely visible too.
So please Riot take sounds into consideration when designing these skins and how it affects the counterplay of these champs.