I didn't say it "works". What I said was basically: Secure boot answers the question "How do I know someone won't write a crack to steal my content?" in an intelligible way (i.e. "Because it locks down all the software that runs on the device in an uncrackable way.")

That's a powerful sales tool. Systems that don't have secure boot have a much harder time selling their DRM implementations. And that's why we have secure boot. Don't fool yourself into thinking all problems are technical.