content: The updates are signed.  That was what Microsoft also claimed back then when they introduced ActiveX http://entertainment.howstuffworks.com/activex-for-animation3.htm The thing is, getting one of these keys is a goldmine for hackers. One key to control them all with  your worm. One WORM update and all Windows 10 machines gets contaminated with the worm. And there is nothing in Microsoft that can stop one out there. Millions of computers all connected to the Windows cloud and to each other, one key one buffer overflow in a key component, and it can wipe out all Windows 10 installations. Instant access to take over Cortana. We are talking about crippling complete communities near light speed with just one key.