I think part of the advantage of going to 48v, which requires less copper, is that it make it possible for Tesla to use the flexible printed PCB/harness, which make installation easier to automate. (At least I think that is one of the things they said.)Why is this a key enabler? Smaller connectors are better, buy why would they be necessary to enable multiplexed wiring? Off the shelf multi-way automotive connectors are available with small pins for signals and larger pins for 12 V power, and multiple pins for 12 V+, and for 12V- can be used for even higher currents.