Convienence. Consoles are popular because you just plop down, hit the on button and play (in theory).

And while people don't care how much spy/adware their computer is, they do care when frequent notifications, popups and updates interfere with what you're doing. Nothing more annoying that having a windows notif steal focus from a game you're playing through steam link in the other room (personal experience).

I'm so glad that they've improved steam and link on linux so much, having to run it on my s/o windows computer was a pain.