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.
A certain $2tn+ company can't manage to pull that off and actually has different interfaces for each platform. We're making some big assumption that responsive interfaces actually work and don't push poor compromises on all users at the end of the day.
This is another UX death march like flat interfaces without cues and mystery meat.
