Jobs wouldn't have allowed it because it is something that would at first glance reduce purchases, as it allows people to back out immediately if they click buy

Jobs wouldn't have allowed it because it is something that would at first glance reduce purchases, as it allows people to back out immediately if they click buy. As far as design patterns for purchasing go, I would say it is probably more optimal than a simple one-click, if optimising for both the buyer and seller's interests. One-click is more optimal if you are only optimising for the seller.