bipolar disqualifies you from holding an FAA ATPL. I'm not sure about flight attendants.
Oddly enough, though U. S. F/As are required to hold "a certificate of demonstrated proficiency," in the U. S. the FAA won't deign to make this an "airman's certificate" even though a wide variety of other ground-pounding job specialties are granted airman's certificates, such as dispatchers and parachute riggers.
Not sure what this means vis a vis your statement other than that F/As are certainly held to very different standards.