The state of university didactics

Most of the people working inside universities work both as teachers and researchers, but they perform the two tasks in very different ways.

Modern research activities take often (almost always?) advantage of international teams of people, peer review and in some ways go beyond the single university.

Didactics, on the other hand, is far back behind as far as I can see (in Italy, at least): every teacher seems to be reinventing the wheel in every single course of every single faculty in every single university, even if most subjects are widely overlapped.

I think this is a big disadvantage for both teachers and students: for the formers it means more work; for the latters it mean a more partial vision of the subject and more error prone didactic contents. If I were a teacher, I'd like to see other teachers' contents, peer review them and maybe use them as my course (under some sort of licence). As a student, I would like to be given easy access to high quality didactic contents even if they are not written by my teacher or inside my university.

I also think wikipedia and google are not enough here, since I'm talking about university-teacher curated university-grade contents. Arxiv and similars neither, because I'm not looking for papers.

Isn't this a major issue in the university didactics? What is the state of didactics in your university?