Hi and welcome...the CNS role is varied. Much depends on what your state allows and how your facility uses CNS. I'm an adult health CNS in school completing the peds CNS.
I only did the CNS because it was available for free at the college of nursing which was affiliated with the hospital where I worked.
I am in the advanced practice role. I do no formal education, I'm not a change agent, none of those spheres of influence. I work for a large nephrology practice and work with 3 FNPs, a PA and me - we all do the same job.
What I do however, is predicated on my state's nurse practice act and in IL, CNS is an APN. However, that is not true in all states. I am also on my state's advanced practice nursing board to ensure that CNS stays an APN - lol.
As to why there aren't a lot of CNS's here vs NPs on their forum - I think because there are fewer CNS programs. Plus, a lot of CNS's do not consider themselves APNs because their role is in staff development, education, or something else.