But there must be an easy way to nearly touch a parked car while entering or leaving a narrow parking space or a small garage and to approach your trailer before hitching it up. Maybe disabled at very low speed.

My Subaru does this quite well and has saved my butt a few times. I can also backup to a trailer with no problem.  RAB can be disabled. I was a bit surprised to find something as advanced as my model 3 didn't have it especially since the cameras are there.