This is extremely interesting
One because windows 7 is going to be EOL next year
Two, you can still get a Ryzen/9th gen Intel chip to work on Windows 7 as long as you do the work around to support it, I done it
Between windows 7 and 10 benchmarks of my setup, windows 7 tend to have better results, maybe fps will be somewhat better with dx 12 and 7 for WoW?
Good for people who have windows 7 pc’s for WoW now they can enjoy fps boosts with dx 12
Edit: read the article again, it seems Blizzard was involved making Microsoft on this decision, good on them.
Blizzard wanted everyone to have DX 12 performance boosts regardless the operating system