Most traditional styles I'm aware of in the Chinese martial arts don't have any ranking system. I know many people often feel like it cheapens the arts (which is potentially true in McDojo settings), but having a well-defined ranking structure and pedagogy can have many benefits for students. GM Sam Chin has spent nearly 30 years developing a clear structure for his family art (Zhong Xin Dao I Liq Chuan).
We have recently updated our website with more details, as well as some explanations of the benefits to the students and how it all works in terms of the principles. This last is via a 17:00 video of Sifu.
https://iliqchuan.com/gradings/
This is an example clip of our Moscow based instructor Daria Sergeeva testing for her "instructor level 5).