Just 4 months ago they announced they were suspending development of OneNote Win32 in favor of just the UWP version [1] Moreover, they have (had?) an entire multi-year roadmap planned around UWP, including the eventual release of a version of windows which was supposed to substantially reduce day-to-day reliance on Win32 for lower powered devices, codenamed Project Polaris [2], in an attempt to compete with Chromeboo…
Endemic at Microsoft. I believe the main reason the Xbox One Kinect - an impressive piece of hardware - failed, is that Microsoft themselves couldn't manage to make one big flagship game for it at launch. If Microsoft themselves are avoiding it, why on earth would third parties invest?