Wrong, Longhorn failed because WinDev sabotaged the project.
https://news.ycombinator.com/item?id=30486727
Likewise, Midori was powering Asian Bing cluster for a while, and even that wasn't good enough for WinDev.
And in Fuchsia, same thing happened, the parts in Go were only taken away when the Go advocates that driven those modules were no longer around to argue for their implementations.
Politics are more relevant than technical limitations.
Finally, Azure Cloud OS and Windows together have surely more lines of C# powering them than Apple has been doing with Swift.
And then there is Android.