Thoughts on Self Diagnosis?

Thoughts on Self Diagnosis? I'm curious about the community's opinions on self-diagnosis and what you all are comfortable with people self-diagnosing. Eg. If a person clearly stutters, but doesn't have a diagnosis, would you be comfortable with them claiming a stutter? What if they claimed to have something specific like childhood-onset fluency disorder? I ask because I know some communities support self-diagnosis, but not every community does.