First of all, "many people" will just go along with what is offered, even if it isn't their ideal solution.

Regarding the sleeping and "fetching" your car, those would still be compatible: simply, if the conditions aren't good, the car would respectively park and wake you up, or inform you that it can't respond to your fetch request at the moment.

Regarding a drunk/high person, it would still be an improvement to the current situation: most of the times you wouldn't drive yourself.