I find "whiplash" comments interesting. Microsoft has been relatively consistent since Vista, everything post-Vista XAML based. Some of the runtimes (which .NET versions are supported, what if any other languages are supported) and brands have shifted every five years or so, but there are lines of consistency from start to finish, and upgrade paths at nearly every stage, and XAML is generally XAML throughout. Things have generally been well supported for good maintenance lifetimes at each stage. (With the shortest probably being Silverlight, and its extended security support hasn't even expired yet, even if no one should have built new apps against it in at least five or six years now and no modern browser has supported running them.)

Compared to Win32 not changing much since roughly 1995 or so, it's wild and constantly shifting, but compared to say JS frontend frameworks it's more stable than a lot of things people are doing in UI.