Comment by ghaff

Well Red Hat did make a go at a supported enterprise desktop distro for a time and, as I wrote, Fedora--which Red Hat supports in a variety of ways for various purposes--is pretty much my default Linux distro.

So I'm not being critical. Yes, Red Hat employees do contribute to projects that are most relevant to the desktop even if doing so is not generally really the focus of their day jobs. And, no, other companies almost certainly haven't done more.