I was in library school before RDA-I just learned what that was last year! It is hard to keep up after a while.
It’s going to be a focus in my “Organization of Knowledge” class this semester. It’s a really new addition to the curriculum. So new in fact, that people who took the class over the summer were still learning about AACR2 which I’m not sure we’re even learning about beyond the “this was the former practice/guidelines, and here’s the new.”