Without VDI, you can make a crystal-clear distinction between the datacenter environment and everything else. The moment that you stand up your first VDI system, the lines are immediately blurred. This is an especially critical consideration for high-security environments, as they commonly place an extra layer of firewalls around their datacenter that distrust the non-datacenter networks. Even when security isn’t that tight, there are usually patterns and practices around handling datacenter systems that are distinct from those around user systems. The full impact of hosting desktops in your datacenter may not be obvious at first.