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Sketch heavily uses macOS specific APIs for drawing, hardware acceleration, widgets, etc - I'd imagine Windows version would be a nearly complete rewrite with much higher subsequent development costs.

Which is interesting because Adobe XD also heavily uses MacOS specific API's and had to do a complete rewrite to support Windows. But Adobe has the manpower to do that.

I think it's just market demand. They have finite capacity to develop and they get more returns by investing in OSX than expanding to Windows. There's always Zeplin for sharing designs to Windows users.

Allusive? I think you mean illusive, or something.

Elusive, maybe.