I don't know why you are trying to trivialize the fact that you must always be aware and able to assume control.Be careful with that - if the County hears that you were letting the car drive in Autopilot mode, they may say "you could have avoided it if you were paying attention".
sadly the op was inexperienced and was not well versed in the way the AP functions which I assume caused his problems.
in addition he was probably not familiar with the 21 in wheel/tire concerns that are well known.
I am not putting down the OP but he certainly was culpable for the issues he encountered.