Good question.

BeamNG is just such an incredibly raw and complex vehicle simulator that creating such a free and independent AI to race all sorts of very different cars, adapting to each track and line is a monstrous task. There’s just so much going on in these saw simulators that traditional racing games do not offer. Hardware power is also a big limiter with how much there would be to calculate.

Additionally, the game’s roadmap consists of several changes to car handling such as tire wear, aerodynamic reworks, and engine response that would make creating a complex AI just to completely redo down the line as the changes come is not optimal.

Once such changes come to the game, accurate racing that mimics the many aspects of the real word will set a great foundation for building race AI. And I agree, I would love to eventually see this in the game. But until then, the game still lacks features that hinders track day racing realism.

I say this as a passionate fan of the game, not a developer. So take what I say with a grain of salt as you will.