The idea that scientists have figured out the cause of mental health problems and we don't need to treat them palliatively is one I disagree with for two reasons:

a) Much of the brain is not understood. Including why consciousness happens.

b) Even if scientists know the cause of mental health problems, that doesn't mean they can treat those causes. Every human who lives long enough will die of a non-treatable disease. Understanding a problem does not imply treatment is possible.