If encryption is anything to go by the making the US's export control list is another way of saying "do not develop this type of product in the US".
Its a nuisance but think of all the civil servants its keeping in a job. Quite the growth industry, I bet.
BTW -- They've been doing this type of control for at least 40 years. Its really been effective at keeping US technology on top and keeping everyone else down, hasn't it?