Thank you for your comment BrandonWolfe,
In regards to WinAppDriver, I understand the concern, there was a pause in development that lasted a couple of years and had many people that rely on this product worried. As far as I know this was due an internal re-organization of the WinAppDriver project team. However they recently completed finding a new internal owner of this project.
Please check this entry. They have a new PM and she has stated the new direction and approach. Sounds like the project is alive and well, although they haven’t resumed active development yet, they are working on an execution plan.
From my team’s perspective, Microsoft Test Team (we do a lot of quality and performance consulting), this tool remains key for us and we will continue to use it and advocate for it internally, as our preferred tool for UI-test automation of desktop apps.