You over estimate the will/knowledge of everyday people to do anything else than buy a branded PC, install Steam and be done with it.
If you got the means and space, I think it's the easiest solution. I do play some games on the Mac, but the experience has been rather poor outside of indie games which usually work very well.
That said, the controller support on windows constantly sucks. On macOS though, it's really easy to set up. Go figure.
It's fine, if you are willing to put up with the forced logins, spyware, ads, unwanted cloud/AI integrations, requests to update/reboot when you don't want to, and dozens of other anti-features that suck up resources and actively work against the user.