I agree that spreadsheet use in engineering is one of the most complicated use cases, but I submit for your consideration another very complicated use case: laboratory software ( https://en.m.wikipedia.org/wiki/Laboratory_information_management_system ) LIMS do what Excel can but with the added benefits of being more controlled, secure, user friendly and faster because they're built upon the back of a modern database. In my experience with engineer built worksheets, the engineer that built them is typically the only one who knows how to use them. This is job security for that engineer, but isn't scaleable for others' use. In the lab software, a scientist builds the methods, and lab technicians use those methods over and over again daily. Each step of each use of the method is recorded with the inputs, the results, who performed it and exactly when. The workflows are built-in and the calculations are comparable to those used in engineering.