I've noticed this trend in recent years to be "open about mental health", etc. And I think by itself this is great, mental health is important. But invariably, especially in management/HR settings (or in the entertainment industry), it is done in an incredibly shallow way.

Mental health is hard. Just talking openly isn't magically going to fix things and may even initially make things worse. It may release feelings that need to be carefully managed e.g. by a therapist. Obviously, no company would ever be able to provide that. Instead, they're just looking for "I started running every morning and was able to fix my depression" kind of stories.