"Car makers are now designing their own chips to give them better control over the supply of parts."
Unless they're also getting into manufacturing this doesn't seem like much of a gain. It just means they're waiting for a batch of their custom version rather than a batch of the generic one. It might be worse - if the plant has eight customers for the generic version and one for the custom product the custom one is going to have to be a lot more profitable to get produced ahead of the generic when capacity is limited.