Why are per-user customizations not usually performed when building a reference image for server deployment?
Quick check answer
Administrators generally don’t bother customizing the desktop environment of servers because they usually manage them remotely using administrative tools and scripts.
The above tip was excerpted from Mitch Tulloch's book Training Guide: Installing and Configuring Windows Server 2012 from Microsoft Press.
Mitch is a nine-time recipient of the Microsoft Most Valuable Professional (MVP) award and a widely recognized expert on Windows administration, deployment and virtualization. For more information see http://www.mtit.com.