I think you may be misremembering some osx fun with cups in the past, just like with Linux. Honestly most activities for the older folks these days is mobile or web based, the tech support needs for them is about the same regardless of OS imo.
Back when I did solo IT work (a good 20+ years ago now), the questions were pretty much the same no matter what was being used too, though the Linux desktops at the time were usually focused on specialty hardware (so the dot matrix they were connecting to was about as easy as it could get).
At the time though, macs were getting popular again, even among folks like me who appreciated Darwin and thought OSX would lean more heavily into open source rather than the outright thievery they ended up doing, but that part is neither here nor there.
I'd say back then it was maybe 65/25/10 split of windows/osx/linux (usually redhat there, and two machines with slack), but the questions were mostly the same. And no matter what OS it was, it usually became a request for me to just do it for them on my next trip over.
If anything, aside from specific bits of software that may be unique to an industry and someone actively working, which OS has gotten far, far, far less important than it used to be.