> raw math of cpu & io performance & costs on an Excel spreadsheet But that's not the raw math; the raw math is "total OpEx", and OpEx for these large systems

> raw math of cpu & io performance & costs on an Excel spreadsheet But that's not the raw math; the raw math is "total OpEx", and OpEx for these large systems is increasingly dominated not by the systems themselves, but rather by development-talent acquisition costs, and operational-maintenance talent labor costs. Even Sabre's choice wasn't "upgrade to z16 vs. move to IaaS"; it was "hire people to replace churned devs+ops to write the next feature of the system: people with z/OS experience, or people with IaaS experience?"