I spent a lot of time tryngito figure them out mid carreer before I realized that high priced consultants made a lot of money selling training me on it to management. The same salesmanship worked on me. Perhaps in part because they were also teaching unit testing which did turn out useful - once I got rid of the bad ideas they taught since they didn't know what worked in the real world but had a lot of money to make by sounding confident when asked questions.