In general the coding aspect of creating this game is very minor compared to the other aspects. I'd say around 5% of my time went to programming even before AI was a thing. Now with AI it's even less. I'd say around 10-20% of the code is AI right now. I'm mostly past the heavy programming stuff (which I mostly did before AI was as good as it is today). I do use AI a lot to create custom tool windows in Unity and to solve bugs in 3rd party packages and libraries, it's very helpful there.