M$ has been the dominant OS for the majority of a lot of peoples lives, accordingly a massive, massive ecosystem has grown up around it.
My IT career has taken me some weird and wonderful places, and there is a lot of extremely specialised software that will only run on windows, and wine unfortunately still has a bit of a stigma with its interoperability. When you’re running shit a business literally relies on to exist, you don’t play games with it.
Fortunately m$ are shooting themselves in the face, which is driving a lot of vendors to rethink their software., but it’s still a slog.