Not just server hardware. The single socket versions will be used for workstations. USB 3.1 would have allowed use of the new high-end external storage systems.

Not just server hardware. The single socket versions will be used for workstations. USB 3.1 would have allowed use of the new high-end external storage systems. Luckily USB 3.0 is still kind of fast. Also, not all servers are set up to be controlled from some remote point. I bet some of these servers will need at least one USB port to install the OS in some smaller installations.