Not great news about Manteca smash and grabs - thanks for posting that. In general, I'm surprised it doesn't happen more often in other semi-deserted locations, but that's just because I live at the crossroads of cynical and jaded.
One thing that may help a tiny bit for those who have tinted windows is to deploy a collapsible sunscreen (such as the $9 one at Costco that lists Tesla (presumably the Model S only since they were made before the X)) no matter the hour. This has the effect of making it just a little harder to see inside your chariot than into any adjacent chariots. Thieves are often lazy.
Whenever I park and then leave my car, it's in valet mode. 100% of the time, period. Won't stop the determined or professional thieves from getting into the frunk or glovebox, but it does make it more time-consuming.
Tangentially, anything of value is typically in the frunk*, otherwise concealed, or comes with me when I leave for dinner or wherever (see this particular backpack which serves as a useful travel bag -
Oakley Kitchen Sink Backpack in STEALTH BLACK | Oakley). Fits under an airplane seat - even in coach, too *twitch*.
While it's still a car and while a skilled crew could still strip it to the frame in minutes (although as far as I know this has not yet happened, given the relatively unique givens), most of the time as above the thefts are crimes of opportunity.
* Even more tangentially, this morning I remembered to compare the new frunks side by side during one of those gallery Social Hours. Mostly due to height, one can still get a full set of golf clubs into a Model X frunk, with room left over for shoes and such - as long as the bag isn't ridiculously wide. I don't know that a miniature golf putter would fit into the Model S microfrunk these days. Yes, world's smallest violin; I can hear it now. But I'm gonna miss the now classic RWD frunk and microwave and fitted/well-made microwave bag accessory.