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Classical analysis 'doesn't work'?

I often come across the phrase: "Classical analysis is dead (or "not working")!" In my opinion - nonsense. What exactly is "dead" from classical analysis? Which phenomena of technical classical analysis have been discarded? What do those who have buried it for individual trading needs mean by

Question for MATHEMATICS

Is there a mathematical way to determine the success of a programmer? AND EFFICIENCY? Not to be confused with productivity