What about marketing? To all people I suggested and/or installed Linux on their computers it comes down to being readily available on a PC (not having to prepare a USB key to install it) and a simple intuitive interface. As much as I like KDE, Gnome is intuitive, but Linux in general is not installed by default, so we need to prepare an external peripheral. Yet in the past when I saw statistics (maybe 20 years ago) I remember Windows was around 90% of market share. So I guess it changes slowly.