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Why all this sophistication in specifications? First, to communicate one's wants in sufficient detail to permit another to unambiguously execute hardware to fulfill these needs. Secondarily, specifications serve as a quasi-legal means to determine when a contract between parties has been fulfilled.
James W. Shean
"How Good Was It? - The Epitaph", Proc. SPIE 0009, Photo-Optical Systems Evaluation, (1 November 1967); https://doi.org/10.1117/12.978093
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James W. Shean, "How Good Was It? - The Epitaph," Proc. SPIE 0009, Photo-Optical Systems Evaluation, (1 November 1967); https://doi.org/10.1117/12.978093