Earlier quoted context omitted.
Yeh that worked out really well for the last two platforms who tried it… Microsoft produced apps that no one used because they were horrible on all devices. Apple conceded defeat and we have different interfaces on each device class.
The recent "scaling down" of Linux Gtk+ apps also encompasses "diferent interfaces". Look at some of the convergence examples, and you'll see all sorts of widgets merge, move around and disappear behind "alternate" views as window sizes shrink, then come back as the windows enlarge again. It's a fully responsive interface that merges both styles of interaction seamlessly.
This is another UX death march like flat interfaces without cues and mystery meat.