Another group have their OS chosen for them by their employer. They don't care about the OS, or software in general - they just want to get through the day.
Perhaps KDE is well suited to one group and Gnome to another?
And KDE can simplified for installation on work computers, just not in the same way as GNOME.
Personally I use GNOME now because it fits my current workflow better, but in the past I had a different workflow and I used KDE more. I still have both of them installed so it's not difficult to switch.
People like Linus Torvalds didn't get their OS chosen for them, but still chose kept Fedora's GNOME default.
Sounds like someone else did make the choice for Linus, even if it could have been overruled.