I listened to a lecture on psychology by The Great Courses and the lecturer said historically they stopped labeling gay people as having a mental illness becaus

I listened to a lecture on psychology by The Great Courses and the lecturer said historically they stopped labeling gay people as having a mental illness because the patients did not respond to treatment, so the logic at the time was not whether the patients were not suffering. The lecturer pointed out this made no sense because in other contexts doctors would not say if they can't treat it, it's not a disease. I'm guessing the patients thought they were going to hell, or thought society was going to abuse them, or they wanted to be heterosexual so they could have kids or whatever and said "please make me not gay, doc". So they were suffering. If "treating the gay" worked it might still be considered an illness today I guess. My point is only the disease labels are arbitrary. And there's a downside to labeling things, especially thing you cannot effectively treat. Also, trusting Doctors without a dose of skepticism can be a mistake.