One of the things that we encountered was a vice between "can you add this filter" and "but I don't need this, only that filter."
In a more general sense, my research suggests that "IT in a box for SMB" is a deadly place to operate. They make sense on many levels, but they don't sell.
I believe that SMBs favor point solutions because they are pain-avoiders. If they've been phished, they want a remedy. Firewall? Content filter" Maybe later...