I know; some instructors can be so pedantic that they often forget the reason many learners are drawn to drums: to play them, not to discuss them academically. Even so, it can be quite valuable to be able to name those strange time signatures when you come across them. Doing so just isn't necessary for most players, as long as they possess natural feel and a reliable internal clock. I'd encourage you to learn as much as you need to learn to suit your own goals. Only you know what your objectives are behind a drum set.Can you please explain to people who teach today. What you just said.