If you dodge Illaoi's tentacles she's basically useless - which means it's skill based - and unfortunately for her - even Gold players can reliably dodge her tentacles most of the time. Faster tentacles would make that much harder to do, that alone would be a significant buff. The other key issue she faces is her tentacles don't defend themselves, are too easily killed, provide gold, and grow back too slowly. This makes Illaoi's advance very slow and predictable - and that just doesn't fly well in high ELO: especcially when it doesn't grant her any guarenteed win condition - lots of top laners can beat her even with her tentacles present. The solution I think is she needs more persistent tentacles, dormant tentacles should never die.
The key changes Illaoi needs are:
- Tentacles attack 30% faster outside of Leap of Faith (way too easy to dodge for competent players), during Leap of Faith they attack 20% faster (down from 50%, so the same as live during her ult, so it's not also a buff to her ult)
- Dormant tentacles last forever and cannot be attacked while dormant (so she can slowly fill the map with them, and enemies can only clear them out when she's near)
Illaoi's whole game is zone control, much like a Heimerdinger or Teemo, but unlike those champions, she doesn't get to choose where or when to place them, and they don't defend themselves. In effect, this makes Illaoi's tentacles significantly weaker than Heimer turrets or Teemo Mushrooms for zone control. The change to permanent dormant tentacles means that Illaoi slowly spreads her tentacley corruption all over the map: so she can ~always fall back into a tentacley area to fight with her tentacles.
The counterplay is you need to oppose her splitpush constantly, you need to face her in battle. If you ignore her, the power of her elder god will seep into the rift.