most people are totally clueless about computers. so, yes, for them they need an OS which is so easy to use it is invisable.
the only OS that really fits that description is amiga/MorphOS. and that isn't quite "perfect", but at least it's not a horror.
I don't agree that (Red Hat) Linux is difficult to
use, once it's installed and configured. I'd argue that RHL with GNOME/KDE is a hell of a lot easier to understand for the average Windows user, than e.g. AmigaOS/MorphOS.
Szulik recommends Windows to those people because of the driver situation, plus the basic computer/Linux knowledge required for installation/configuration.
His 90-year-old Windows using dad would probably have a harder time finding the "IBrowse" icon (and then wonder why web sites look like crap and why he can't see those purdy animations that everybody else can see), than he would have clicking the GNOME menu and choose the item called "The Mozilla web browser" (and everything renders just like on his pals' Windows boxes).
When he plugs in his non-supported digital camera to see the photos from the old folks home's picnic, he'll be just as confused when nothing happens in both Amiga-/MorphOS as in Linux. And why doesn't anything happen when he inserts the CD that came with the camera? Why can't he get "Grand Theft Wheelchair 3" to run?