It's not. Neither you, nor Microsoft, knows what's best for people.. so stop presuming you do. That is a very disturbing trend in the tech industry these days.
Having automatic Windows updates on by default and requiring a device administrator to disable it is prudent. Removing the ability to disable it is presumptuous and short sighted. I'll give you some scenarios why.
1) I'm giving a presentation on my laptop. Windows updates and restarts and the entire audience has to wait 10 minutes. Why don't I have pro? I don't know. I bought this stupid thing at Best Buy!
2) I'm trying to download a large file at home to get some work done and it's going at 20K/sec because Windows has decided it's time to update and destroy my bandwidth.
3) I'm in the middle of a game or some work and my computer just reboots because it has decided to update.
4) And of course: my computer updated and now my webcam doesn't work (this actually happened to me recently).
The crux of the problem may just be that Windows doesn't do updates very well. Regardless, the lack of choice and configuration is not, and should not, be a welcome "feature".