How much more all encompassing can you get than that.
I assure that Apple never went out of its way to release firmware for the 1st gen Intel Mac Mini so it could work with Windows 7.
Windows 7 supported all of my Mac hardware - Bluetooth, gigabit Ethernet, wifi, and it found the IR sensor for the remote. I never tried to use it.
Even before that, I had more obscure x86 hardware - a 486DX/2-66Mhz “DOS Compatibility Card” for my old Mac that came with Windows 3.1 and had a built in Soundblaster card. I was able to our Windows 95 on it without any updated drivers from Apple.