Chromas and Visual clarity concerns.
Some chromas look really nice, but others well, I have issues with. It's really hard to explain, but Yellow Fizz is pretty much the deal breaker for me:
- Certain champions are deeply tied to a certain color scheme (i.e.: blue/purple for Fizz) giving them a completely different color scheme makes them harder to identity.
- Full body chromas (i.e.: Blitzcrank and Fizz) look odd. Yellow/Green chromas blend with the ground, this is even worse on smaller champions.
As someone who has issues with iBlitzcrank and Volibear, I really think this should be looked at.
tl;dr: Chromas and skins shouldn't make champions harder to see and identify.