You've never debugged really bad spaghetti code, I'm guessing? After a certain level of complexity, it becomes impossible to tell what thing does what, and som

You've never debugged really bad spaghetti code, I'm guessing? After a certain level of complexity, it becomes impossible to tell what thing does what, and sometimes all, none or some of the levers must be pulled in a particular, or no particular order to get the behaviour you want.