I don't think its so much that the cars must be built with old chips, its that the designs are built, software written, tested, and safety certified around the

I don't think its so much that the cars must be built with old chips, its that the designs are built, software written, tested, and safety certified around the specific chips they have. Whos to say the full process to swap out a handful of chips within the car and getting any required tests and certifications done wouldn't take as long or longer than waiting for the next production run of the spec'd chips?