It's 3am and I've been woken up to deal with a production problem of reasonable seriousness. After login, I'm assaulted with the appstore's recommendations for things like sports news and various games they think I want to know about.
At the time, I couldn't imagine how anyone thought that putting this sort of thing onto their flagship server OS was a good idea.
I realized about then that Windows was lost, MS didn't have the desire to promote it, and it became clear that their only real play was Azure and spyware.
It doesn't exist because the politicians decided (with the help of the person with the patent) to force it on the public by writing laws that said they all had to have this tech when it became viable.
In addition- just as with airplanes- when your life is on the line if a thing doesn't work, you're very conservative about change (oh please add a battery and electronics...)
Third- it doesn't solve a burning problem- if the market wanted it and without #1, it would be available.