It does provide detailed steps for a solution to a problem. I'm sure many people will appreciate that.
Most people around here seem to have somewhat decent system-admin skills, but there's also lots of students and even professionals who just haven't messed around with virtualization very much.
I'm pretty good at using VMWare to set up Linux systems in Windows, but I haven't tried the opposite yet. Sure, I could probably figure it out, but it's nice to have this guide to fall back on if something goes wrong.
I have not witnessed this myself but I have heard countless stories from friends/colleagues in the same vein - there seems to be indeed a big gap between one's coding abilities and the overall computing knowledge.