>most if not all of them would likely have been even better off with other approaches

I hear you, but don't think you understand how incredibly debilitating anxiety and depression can be. Other approaches can be very effective, but often mental health issues make those other approaches completely inaccessible. Antidepressants aren't prescribed in order to cure problems, they're prescribed to improve quality of life, and there's no reason they can't be used in conjunction with other approaches.