@ashleyyrain this. Diagnosis acts to re-situate the problem away from the societal factors that cause it and onto the person who suffers from it, putting the onus on them to deal with. And usually, pressuring the person to change themself to fit the system, rather than changing the system to fit them.
This tends to happen whether or not diagnosis is well-intended. And whether this is formal medicalised diagnosis, or any other system of attaching problem labels to individuals.
There's a reason capitalist systems are really keen on handing out diagnoses.