Look first at the problem you are attempting to solve. Figure out what the path of least resistance and maximum efficiency is towards the solution, then build towards that. Sometimes that means no AI. Sometimes it means a little AI. Sometimes it means all the AI. Don't just look to give everyone sports cars though, simply because sports cars are cool. Balance the reason why. That ability to reason through the problem in multiple steps is what AI still struggles with compared to humans. That is the Engineer's area to shine!