Not to add what's been said, but I think you're also looking at one car and one track. I ran an offline over the summer with the fo8 and can confirm a lot of what you said. But there's also something's you forget. If you race on Kyoto National, you'll actually find that the AI's dive bomb a turn right before getting onto the oval. That same turn, but on Kyoto Nat- Reverse, they do the exact same thing. But so far, its the only part I can find where the Ai's do something realistic (human).
If they decide on using a better AI system, then I think they also need to fix their racing lines. For "Beginner" and such, I think the racing lines are just right, but on "Pro" I think there needs to be a new set on a few tracks, & the oprion of a "Rolling Start". A great example would be Blackwood- Rallycross. Online, we know who's new by what racing line they use on the banked U-Turn and at the end of the backstretch. I think LfS could use their knowledge of to improve this, but only if they have/want to.
Along with the top, I there's a few "Custom" tracks that should be made Standard. Blackwood- Historic, South City- Oval, Fern Bay- Classic & Oval, Kyoto- Internal National, Extended GPs, Aston- Bannana Route. Along with these few, I personally wouldn't mind seeing every destination also having at least 1 Rallycross track. (Even South City could have one somewhere.
This is more of a wish list, but its definitely not impossible I'm sure. I'm not going to go on and on that this needs to be done now, because it doesn't. Things such as "Rolling Start" and new racing lines would take time and we need to respect the creators for giving us what we have and improving it to this point. I'm not aware of what's next, but I do wish to know. Until then, the AI's are okay and greatly done.