The number of Scrivener style applications for Windows are, indeed, an indicator of how hard it is to develop Scrivener style applications for Windows. There are lots of them for MacOS, and even a rather hefty chunk for iOS. For Android, I know of none, and for Windows, I'd be hard pressed to name more than a handful, and most of those are ports of Linux applications. None of the Windows ones are nearly as mature as Scrivener, though some of the MacOS ones definitely are.
That's nonsense. There are Papyrus and Patchwork. Both of them are without any doubt more mature than Scrivener, Just because you don't know any Scrivener style applications for Windows that doesn't mean they don't exist.
And yes, I'm also rather annoyed about a) the delay for Scrivener 3 and b) all the apologists in this forum. Literature and Latte haven't simply been able to develop their software in the time they promised.