I have the exact same experience with AP. I trust it on highways until a merge or lane split is ahead. I think it's so silly that the decision making isn't more robust..
If I can't trust AP with simple road rules, then why bother upgrading to FSD?
FSD handles road rules significantly better: the road up to my house has a complicated five-way intersection with a railroad crossing that EAP could never handle. FSD navigates it perfectly. For my 40 minute compute, there are about three spots where there’s predictable road issues that force me to disengage (no safety issue, just the car gets really hesitant) but otherwise it’s obviously an upgrade from non-FSD.
If I can't trust AP with simple road rules, then why bother upgrading to FSD?