I want to ship ebooks everywhere but limit paperbound books to the US only. The ship-to-countries process won't let me do that. Try it.
If I follow the rules (your staff agrees) and I set up an ebook product to be shipped anywhere, and save it, that will freeze the ship-to countries system so I can't go to another version of the same product (or any other product) that is paperbound and limit the shipping to the US only. Important because foreign bound book shipping is far too high and reduces our profit. It often costs more than the book!