you can use most windows 8 and some windows 10 drivers in windows 7
MOST hardware from the last two years or so don't HAVE Windows 7 or 8/8.1 drivers. Going forward, there will be practically zero hardware manufacturers offering drivers for these obsolete operating systems because Windows 7 is now EOL and Windows 8.1 has a MUCH smaller user footprint than Windows 7 did. Most users who WERE on Windows 8 have already migrated to Windows 10. Hardware manufacturers don't want to have to develop drivers for multiple platforms any more than what they absolutely have to, because that costs money and resources in man hours, so if they don't have to, they won't.
As of yet, I have RARELY seen a Windows 10 driver that was manufacturer specific, versus a "generic" Microsoft supplied driver that allows for only basic functionality rather than full featured usage, that worked in Windows 7.
I think if we revisit this article in a year we will find that much as when the world moved on from Windows XP, Windows 7 will have been left to the pages of history. I know a few fairly astute high end enthusiasts and overclockers and to the best of my knowledge, they are ALL using barebones or fully fleshed out versions of Windows 10 for everything now because they realize that testing on Windows 7 is not realistic when it will not be in use by the majority of people. Anything done on Windows 7 is no longer realistic because that is not what most people are or will be using going forward.