There's no need to use ceramic or any other exotic materials in a production car. They're even overkill on most supercars, it's just that the owners want to be able to outdo their mates with lesser supercars.I wonder if it would be feasible to cost engineer the manufacturing processes used for ceramic composite brake discs, such that they became an affordable option?
Tesla seem to be keen to explore novel manufacturing methods in other areas, like their new single piece, pressure die cast, aluminium alloy rear subframe. They must have put some serious effort into engineering that solution, as they apparently had to develop a new alloy in order to get it to work. Perhaps if that team was given the task of looking at making cost-effective, corrosion resistant, brake discs they might come up with a novel way to produce them.
Treat your brakes right and they will be plenty good enough and last a long time, especially on an EV.