Earlier quoted context omitted.
AFAIK GNOME doesn't really do desktop icons and the ones Ubuntu added were actually a GNOME extension. Ubuntu chose to bundle that extension so the burden on creating a unified experience should be on them.
> AFAIK GNOME doesn't really do desktop icons So the GNOME people are taking their inspiration from Windows 3.x?
It's not really taking inspiration as much as trying new things. Everyone has copied over the desktop because everybody else did so, all the way back to when Apple first ripped off Xerox's GUI. Even on Windows I disable all the clutter of desktop icons that programs will randomly add to my desktop because they deem themselves important.
I personally don't see the benefit, but people who do can pick a distro that writes a well-integrated desktop icon addon (apparently, not Ubuntu).