Earlier quoted context omitted.
Small nit: I can 'jump' (read: charge the battery of) other cars with my model X, as long as the other car is an ICE car. In the frunk there is a panel that pops off and underneath there are (unlabeled) 12V and ground terminals that I can put jumper cables on. However, I have had to get my car towed a mile to a charging station before, I really deeply wish I could have received a jump then.
I would be cautious doing that. The analogous (I think) terminals hiding under the old Model S nosecone are not particularly thick, and you might fry something. Also, if they are fused (I don’t know whether they are) and you blow the fuse, then merely opening the doors of the car if anything else goes wrong with the 12V system becomes quite complicated.
Regarding the topic of the original post, it is infuriating to try to figure out which fuses do what in this car. It is information that is simply not provided.