Has anyone ever been a part of a school where the Staff Representative role was used optimally? What did it look like? How did it go? Did it help to create a positive atmosphere in the school?

Would like to start a discussion about what is necessary (or useful) for being hired for leadership positions in IE (Principal, AP, HoS, etc). Side question is to evaluate the efficacy (and necessity) of being a "qualified principal in your country of origin". Have seen this requirement on a few JD's, so I'm wondering how common this is and how important it is. Any insights into training, certification, or other important qualifications or experiences help to open doors to being hired for these kind of roles.
Thank you.