Illaoi needs to be less reliant on landing her E to be a threat
Example scenario: Illaoi and Darius find each other in the jungle and fight. If no allies help one of 2 things will happen:
Illaoi lands E, ults, then forces Darius to run or die where he stands as she does a ton.
Illaoi misses E and gets chased down and killed by Darius as she cant fight back.