> It seems to me that Tesla has been coyly but deliberately encouraging and facilitating a usage pattern which, for legal/liability reasons, they forbid in the manual.

I'd agree with you there. Same with Summon. "Deal with a fussy child while your car comes to you" says the promotion. Legalese says "must not be distracted (like you might be by a fussy child)".

I'm sure that the manual probably says something exactly like that: "Driver is required to keep hands on the wheel. Your vehicle will warn you to put your hands on the wheel if they are not every fifteen minutes". Nudge, nudge, wink, wink, and don't mind our CEO blatantly not keeping his hands on the wheel in our videos.