Yeah, it's the same for garage door openers today. I took the OP simply to be saying that physical access of some type needs to be available (ie. to stop anyone initiating a pairing). Some cars require the key to be physically inserted into the ignition switch, which requires the key to be correctly cut to match the car, before pairing; which is a nice extra hurdle to stop thieves quickly pairing after they break into your car.

Whatever the case, making it easier to pair, shouldn't be the primary focus, no need to help a thief doing it quickly. It would just be nice to have a way to do it, that didn't ultimately require the manufacturer to get involved; but that does remove a big hurdle for thieves, too.