illaoi is proof that too much counterplay can exist
and that it leads to very binary gameplay
each spell being telegraphed and delayed, slow and easily avoided or interrupted means that she has to be disproportionately punishing to the effort she puts in. because that's basically all she is -- a punisher. the degree to which illaoi telegraphs herself makes it so that a lot of her power isn't in her actually outplaying you, sometimes not even in her playing well, but you misplaying against her. this leads to frustration for both sides because she ends up with extremely lopsided outcomes based on one single ability in her kit. she is probably the fairest champion in the game, but is that really a good thing?
tl;dr buff illaoi
on release and now he's balanced