"1. But I use windows for gaming! Steam has more than 200 titles that run just fine in Linux. Popular indie games and mainstream shoot-em-ups alike. they even offer steam machines as a platform if youd rather not fuss with Ubuntu."
Awesome, Fallout 4? Oh, no, too bad. Skyrim? Grand Theft Auto? The Witcher? Oh. Well, let's take a look at Steampowered.com and see all these mainstream games......ooh. Haha.
"2. I need it for office documents. No, it needs you. Libreoffice and a host of other tools let you edit and author office documents easily from any modern operating system."
I have never seen an open source office clone that didn't have compatibility issues with MS Office. And no, I'm not going to convince everyone I work with to switch over, too.
"3. well its what my office uses so... your office and about a million others use windows, but likely still windows 7. Things like email, calendaring, and federated login have existed for decades before Microsoft bundled them into their OS. Most of the services you use online arent contingent on your windows domain. Windows exists in the office out of comfort, standard, and price. corporations license their infrastructure for a fraction of what it would cost you to buy it."
No, my office uses a combination of Windows 7, Windows 10, chrome, and OSX. We all do quite fine.
"4. $os_name is hard. it doesn do $feature. "
I first started using Linux back in 1994; I worked as a linux administrator professionally. I still use Linux occasionally on both a laptop and desktop. I don't use Windows 10 as my primary OS because I don't know how to use Linux, I use Windows 10 because it is a better environment for the majority of what I have to do.
"perhaps 8 years ago it was meaningful, but times have changed."
See, THAT applies more to Linux. Back in the 90's Linux was head and shoulders above Windows, which is why I used it then. By now the performance and stability differences have mostly vanished, with one exception: Linux is still better at scaling down to lower-powered computers, which is why I use it more often on my cheap low-RAM cloudbook. But Windows still has far, far more useful applications than Linux, is just as stable, and looks a little prettier for what that's worth, which is why it is my primary OS.