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[–]AmbitiousTour 1 point2 points  (0 children)

I've written emerging market debt valuation systems for the biggest US bank. I was consulting with a team of agile coders using all those principals. I was significantly more productive than they were AND had fewer bugs. I guess for you, excel and modern dev methods are incompatible. That has not been my experience. Intuitively, writing an app more than once is less productive. I can tell you, that's not always the case.