Mashiach Agent I don’t quite agree with you.
Many people who are depressed aren’t this way because they objectively think their life are bad.
Some people live in very good conditions (E.G. they have a caring family. and a stable job) and they are still depressed. So even by secular standards they shoud be happy with their life. And they are not!
There’s someone I know who’s depressed. And I wish this person knew how much their spouse needs them and loves them, And how much their children love them and what an impact they can have on their life.
So I think that many times you don’t need Chovos Halevavos to rule out depression being logical. Problem is, it’s sickness and it doesn’t succumb to logic.