One would think it is time M$ called a halt to the 'development' of 10. It was a nice try but doesn't really work, and start afresh with a completely fresh slate. Dump all the old bug ridden code from the days of 3.1 and the tacked on patches over bugs that are themselves patches for prior bugs, remove all the backdoors and telemetry code and produce a real UI that looks good and is practical.
If they managed that more people that have left the windows fold might think of returning. They could even consider calling the new OS 'doors' to remove the stigma of windows.