The reason why Riot don't want to change kayle's looks (theory)
So my theory is that riot is not changing how kayle looks drastically because they already made a cinematic about Kayle and Morgana to be released alongside patch 9.5, so they don't want the 0in-game Kayle to be different from the cinematic Kayle, that's just my theory nothing confirmed yet (though I hope it's true because I love league's cinematics a lot). Edit : or it might even be a new comic, by the way i am perfectly fine with the rework and i like it