I'm not dismissing mental health care. Mental health is very important and as a society we don't put enough into treating/helping/improving it.

Like your depression example, should they be in the same bucket? Now as a layman, my understanding is they are due to low levels of serotonin being absorbed before re-uptake. So they have a common cause and treating that cause will probably help both parties. If there is a different cause like insufficient serotonin creation that should be treated differently.

If we took a trial of a new treatment it may only help those with low serotonin creation but with both groups in the bucket it may be deemed ineffective since the group it helps in such a low percentage of "depression".

All of these conditions affect your life, all should be cared for, studied,treated etc. Yes they are serious.