The served license model was really designed for sites with a LOT of developers, where creating individual .LIC files for each and every workstation would be a complete PITA. Instead, you'd create one .LIC file, stand up a SySAM server, and have everyone connect to the SySAM server to authenticate.
Supporting VMs and remote desktops with a served model only made sense. With local unserved licenses, you'd theoretically be able to create one licensed VM and roll that out to as many developers as you wanted.
-Paul-