Decoupling refresh cycles lets data center customers purchase server compute nodes, which are essentially very small motherboards (processor, system memory, boot environment, management, and connection to a local network fabric), separately from rack-level data center network interfaces (1GbE and 10GbE), separately from mass storage (hard disks and solid-state drives).
Haul out those data scientist demand projections for a refresh just as several tech consultants had predicted a year ago, new technology looks ready to simplify a lot of the analytics so a business analyst, maybe even a mere business person, can handle them.