I know you're about the dozenth post like this on Slashdot, and while the answer is obvious, I'd say that demonstrates the shift in Slashdot's audience and quality over the past decade.
The answer is that Slashdot is an open source and linux targeted website. The audience is assumed to have interest in development and software beyond your basic "I use whatever has a monopoly". It's long been impossible to avoid using Windows because of all their software and hardware lock-in thanks to their desktop and office monopolies. As a hub for the linux community, a goal common to Slashdot, its users, and its articles, was getting Linux to the point where it was a valid second operating system option for desktop computers. Your post helps demonstrate that while Linux may have succeeded on mobile devices with Android, the Windows monopoly is stronger than ever on the desktop.
Still, it's sad to see that Slashdot's community is now the type to respond to "What is still preventing you from having a 2nd choice in operating systems" with "But my 1 and only option is my 1 and only option, why would I want to use anything else?" Can't you imagine a world with multiple operating systems available to choose from, and real competition in features, quality, and design? Or is the stockholm syndrome of Windows really too strong to even consider there could be a better ecosystem for software?