Okay, and? Take a closer look at the link I posted. That still shows Windows 7 32Bit users and MacOS users. More of a statistical anomaly. What Steam shows is meaningless, not everyone that has a PC is a gamer. There are more Windows 10 users than Windows 7, simple as that. If we are going to use statistics to try and prove Windows 7 is the larger install base, they all say the same thing: http://gs.statcounter.com/windows-version-market-share/desktop/worldwide
It was just revealed recently that Windows 10 install base is now larger than Windows 7. If we are going talk about shooting yourself in the foot, it would be forcing support of Windows 7 still. https://www.computerworld.com/article/3199373/windows-pcs/windows-by-the-numbers-windows-10-finally-dethrones-windows-7.html And with inevitable cries of forcing support of DX9/10 and XP, most game companies dropped support for those awhile ago.