Here is a more modern example, after acknowledging that WinRT hasn't been the success they wanted, and starting the Reunion project to merge Win32 and UWP worlds, they are still running them in parallel and it will take several years to fix 8 years of doubling down on WinRT in detriment of Win32, but they will eventually get there even if the ride isn't as smooth as it should be (like killing C++/CX).

However until then, UWP apps will keep running.