It sounds zero insane. Adaptive cruise control taking into account merging would be great. And it's valid to complain about automations that make your car worse at cooperating.
This entire thread is people complaining about automation and FSD. Then you want an advanced feature, that requires a large amount of AI to do, as a toss-in feature to basic adaptive cruise control. Do you realize how far ahead Tesla is to everyone else?
A large amount of AI to shift slightly forward or backward based on turn signals? No.