You're not wrong, but in my case and presumably others there already are USB ports and relevant drivers for both playback of media files, and funny enough for applying security patches or other updates.

In practice I think the concern becomes most USB storage devices are not intended to be constantly written to, while vibrating from the car, and it would definitely destroy data and cause support complaints. But it's still annoying all the hardware and most of the software I want is there and wouldn't take that much more to do what i want.. but instead if they ever do decide to let us use the built in cameras as a dashcam, I expect it will require replacing my entire car with a new model