Even before that, Win7 was still the OS used by the majority of users on Steam. Win10 followed after, but was less then the Win7 user base. And, you assume the vast majority of Win7 users are pirated... just... because. When, WIn10 is just as pirated. All OS are. Just because something is new, doesn't mean it's the only way to go. Out of my friends list on Steam, more then half still use Win7 simply because they prefer it. They dislike things about Win10 and have no plans on updating anytime soon. And, even though I use Win10, I can see and understand their issues. But, 4A Games, yes they will push the top end API tech available to them, but that doesn't mean in any way that the game will be exclusive to any API or specific technology. The more probably, realistic and believable possibility is... they will support multiple APIs and offer an experience that can be had by more. As they've done in the past with previous releases that supported multiple versions of DX. People say it'd be more expensive for 4A to do this, logically, it'd be more financially damaging to not do this. If they forgo older OS and versions of DX, they cut a large part of the possible marketbase out and by extension, cut out a lot of possible profits they can not afford to miss out on. Spend a little more to ensure a larger user base and financial gain.