What is problematic about mental illness in my experience is that it is socially disruptive. If someone breaks a wrist it can be placed in a cast and the individual can return to their roles in the world.
A person with severe mental illness posses a problem to both mind and body, the social and the physical. As someone with depression I know crying in the workplace because my father offed himself when I was young is different than having a broken finger. Many psychiatrists and psychologists emphasize the physical aspects of stress.
Sapolsky on Depression
What psychology often overlooks, in my experience, is the social elements of mental illness. An example that could overlooks a social aspect of mental illness is where the DSM has frivolous spending with negative financial consequences as a criteria. If this is the primary symptom in an up and the person is rich enough where it has no financial consequence, is it a symptom? If the person makes ten thousand a year, shouldn't this be considered in the writing if symptoms in the DSM? Perhaps it is, it's been a long time since my days off wanting to be a psychologist.
Furthermore behavior which may reflect the inner workings of our brain is often a site of meaning making and the interpretations of the other. How a person acts in the world is interpreted! (Symbolic Interaction, Existentialism too many books to list) An example of this in my own life was my co-workers giving me nudges about staying up late drinking alcohol, and someone mentioned that others at Target we're addicts. My behavioral signs caused by depression indicated similar acts associated with excessive drinking not to mention living with four roommates who played loud music past midnight. How can we simply stop at the biological components without considering "the mind" is indeed an imperative ledge to jump from! The mind here is for me undoubtedly social!
If I'm not sleeping well, have 80k in debt, am stuck on a lease for the next six months, ( thank God that's over) and know I have to teach an English class 5 hours and push carts 8, because it is morally right to pay off loans, not to condemn my cosigners to the debt, etc, this social situation must have some effect on the lymbic system! Thus what happens when our minds say, " I need to go to the grocery store and pay bills" or "should I take a risk and gamble" is overwhelmingly more complicated than looking at the lymbic system and saying, "looks like a bad storm coming". Adding some electrical flare or some happy chemicals and leaving mental illness only up to psychology and its biological bias will get us nowhere! Even with biology being as complicated as it is, I think even if we had a comprehensive understanding of the brain we could not manage to appropriately make sense of human behavior, including mental illness, without considering social components. Even if my biology is condemned to it's annual dip in mood because of early life trauma, this biological ontology omits the operations of masculinity which most likely lead my father to the grave.
So sarcastically, yes oh yes, I am physically depressed because genetics caused it, not just another generation of broken men who met the ultimatem, "it's either the booze or the family" and because he could not go to counseling for fear of breaking social bonds with his manly booze buddies because seeking help would make him weak, thus unmanly, he took a gun to his head, and well is condemned to pushing up daisies in a grave built in a swamp somewhere in the sticks where another generation of boys are learning to shoot guns and drink booze to avoid all feelings but anger!