So what, we are doing it on Windows laptops and no one is ever allowed to touch Github beyond getting stuff out of there to spare money on licenses.
So no, Githib is not a metric for enterprise development.
And you are right Winforms is legacy, all modern Windows applications are written in WPF.
I have been doing it the last 4 years, and dispite the HN Web bubble, out there in the enterprise there are companies actually adopting UWP and migrating their laptop fleet to Windows 10.