I was on birth control for 5 years and had some friends on it too. My very anecdotal data is that: while none of us faced any mental health changes, there were some physiological changes that I did not like.
You're right that there are women who maybe severely impacted mental-health wise. But I think the benefits outweigh this as the lack of ability to control one's reproductive life can also be debilitating, mentally. And I like to think that impact is not much worse than what alcohol, drugs, even cough syrup can do to one's mental health. At least birth control can be stopped and is not addictive.
You're right that there are women who maybe severely impacted mental-health wise. But I think the benefits outweigh this as the lack of ability to control one's reproductive life can also be debilitating, mentally. And I like to think that impact is not much worse than what alcohol, drugs, even cough syrup can do to one's mental health. At least birth control can be stopped and is not addictive.