The beauty of ACC is it lets your disengage mentally. You can be aggro if you want to with it on, but I found it's just not emotionally worth it to get mad at being cut off anymore in a car with ACC. ACC just handles going forwards and I'm not having to touch gas nor brake. If I'm not touching either, I don't have to panic react to getting cut-off, just make sure the ACC is handling it, and if that's all I need to check, vs slam on the brakes, then eh.