For redhat 8.0, I used a vanilla install (I think they called it workstation install), and while xsltproc was installed none of the docbook stuff was installed. I was able to find the correct style sheets, but the rpm install puts them in a different location than expected by the current documentation build process. A tarball with clearer instructions would probably go a long way to making it easier to update the docs.
I can't see passing all of the doc updates off to Roberto and Vinod, as that creates a bottleneck. Not that I'm impugning their work, but I think it's better if any developer can easily update the documentation on their own. After all, just recently, Roberto suggested we should halt all development work to fix the documentation. Making the documentation easier to update, might help in making it so such extreme measures are not necessary.