I started using windows when it first came out. Now I'm 76 years old and I'd rather put up with some of the odd things it occasionally does that I know how to fix than try to learn a new OS.
Yes. Most of the world for better or worse uses windows and Microsoft in recent times has been working with Samsung to make the windows experience more fluid and enjoyable with phone integration.
Windows is a nightmare. I'm dual booting or use DEX and Android if in win 10. The steps you have to go through to basic stuff is outrageous. The UX developers obviously don't use the product.