It doesn't mean you easily set up shop in the other domain, sure. But the two processes are much closer than never having worked in a regulated environment. Especially at a corporate level, you have a much better idea of what is involved if you have been successful in one domain.

You'd have to hire a bunch of people with domain knowledge, but you are better off than starting from scratch.

If I am hiring engineers for aerospace, I'd rather bring someone in from medical devices than no regulatory experience, all else equal. Same in the other direction. Principle extends reasonably.

I guess there are lots of reasons I'd think it would be a big jump for apple, but "they won't get their head around the regulatory requirements" isn't really one of them.