This is not the first 48v debate. Several years ago is came and went over the desire for electric brakes, solenoids rather than hydraulic calipers. They would theoretically be cheaper and simpler to manage electronically. 48v or higher would be needed for such things (also for running AC pumps). But brakes are very established and mature tech. They are also the primary safety system. Antilocks work well enough as is. Manufacturers balked at the idea of starting from scratch with purely electric brakes. With the need for higher voltages mooted, the debate came and went.
Anyone worried about hacking cars, imagine the nightmare should brakes be completely electric, with no hydraulic or mechanical option should either the power or control system fail.
As for saving weight on cables, smaller metal doesn't mean smaller cables. Higher voltage would require greater shielding, thicker cables. The increased risk of sparks/shorts would also be a thing, as would the risk of electrocuting those working on their cars. With 12v you can get away with stuff that at 48v might put you in hospital.
Anyone worried about hacking cars, imagine the nightmare should brakes be completely electric, with no hydraulic or mechanical option should either the power or control system fail.
As for saving weight on cables, smaller metal doesn't mean smaller cables. Higher voltage would require greater shielding, thicker cables. The increased risk of sparks/shorts would also be a thing, as would the risk of electrocuting those working on their cars. With 12v you can get away with stuff that at 48v might put you in hospital.