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Not the whole story, perhaps, but part of it: up though the early 1980s at least, people like scientists, financial analysts, or even EEs and MEs often didn't interact directly with the computers and embryonic spreadsheet or statistical or engineering packages of the day. Programmers did. Yes, those programmers were technically doing computer programming, but the algorithms to use were being fed to them by their superiors, and their day to day life was more like being a secretary using Excel than than being on a modern software engineering team.