Devil Dino’s abilities are designed with the dumb AI in mind. Prehistoric Bite is just flat out overpowering because it’s expected he won’t use his green all the time due to the AI’s flaw. Even with scaling it’s hard to see his level drop to something you can manage. The AI’s weakness is built into his inherent strength. So if you made the AI smarter, you’d have to rebalance Prehistoric Bite or you might as well just skip all nodes with Devil Dino if stunlock doesn’t look like a viable option. Yes this is a relatively minor part of the game but there’s a lot of PvE stuff where you can see the weakness of the AI is factored in so there would need to be a considerable rebalancing of encounters.
An unrelated but similar example would be Venom + 2 purple AP generator in Heroic Venom. Why would you design an encounter where the computer takes 3 turns for every turn you get after turn 3? How can that possibly be fair? Probably because it’s a stock template for ‘anti Spiderman/Magneto’ encounter, despite the fact that they cannot be used in that event. The game’s various balance issues heavily influences all the PvE encounters themselves, so even fairly minor changes can have a rather large impact in the overall balance and thus is not as easy as it looks.