Now that I know what I know about the battery connecting directly to N1, I agree with you. With the etorque system, there doesn't seem to be much risk jump starting to N1 or much reason to do it as long as the battery to N1 cable connections are tight.That makes sense, but I'd still argue there's no risk as that wire is ~12" long and connected directly to the battery positive. Overloading it in a jump start event is unlikely. I could have 100+ amps running off my aux switches alone so I'm guessing that terminal is rated upwards of 200A anyway. Logically the N1 shouldn't make any difference in a jump start vs the positive terminal, likely the op had success simply because the cables were connected long enough to recharge his dead battery enough to wake up the electronics and get the systems back online.
Many people may not know or understand which system they have, so as a general statement to cover both ESS and eTorque systems, I think we can say that there is either no benefit or a possible risk to the system when trying to jump start connected to the N1 terminal. Jump starts should use the main battery terminal as recommended by the owners manual.