I'm an AI modder for Civ. Civ 4, Fall From Heaven AI, Civ 5.

Civ 6 hasn't released the source for the DLL, so none of the AI modders can do anything about it's AI. We have the tools, we're aware of how it works, we're just completely held back until Firaxis releases it.

Base Civ 5 AI is terrible. Modded Civ 5 AI is glorious.

Every single AI modder has quit, waiting for the DLL. I don't even know if we get everyone back the longer they wait. Really disappointing.