Admin Arsenal co-founder Gwen Hilyard was interviewed by Bob for this book. You can find her interview, where she discusses Systems Management software, at the end of Chapter 3.
A quote from Gwen (page 97):
“Our main reason for going with a desktop app was to get away from server infrastructure and all the installation and configuration headaches. A selling point of Admin Arsenal is the minimal time it takes from download to usability, and a server would get in the way of that.”