How you're feeling on a scale of 1 to 10, cause that makes so much more sense than using words to say how you feel
It's all part of an objectification process. You as a patient are viewed as an impersonal object on which to perform certain procedures and to generate knowledge. This knowledge – diagnoses, observed behaviours, results of standardized evaluations like asking you to rate your mood a scale of 1 to 10 – is then used to further manipulate you, to generate a desired outcome.
The method of psychiatry is flawed at the core, because it assumes a subject-object relationship, which stems from the development of the scientific method in the 17th and 18th century; but science largely deals with inanimate objects without a subjective experience. You can observe a rock or a galaxy in every which manner you want to, it will not influence the behaviour of those objects. But as a psychiatrist, this observer, subject- object approach
heavily influences the behaviour of your observed "object"; the formal aspect of the relationship cannot be ignored in subject-subject relationships.
Common sense should tell them: Being treated as an object for experiments by all-powerful strangers in a lab cannot
possibly be the way for a person (a subject!) to build trust, confidence, autonomy etc.
Imagine a traumatized and mistrustful dog. How would one go about helping this dog to trust again, to feel better about itself? By respecting it's boundaries and thus slowly earning it's trust and getting to know it? – or by putting it in a cage, restraining it, giving it injections, screaming at it, watching it from a distance in a suspicious manner, etc ?
You should read R.D. Laing, he was one of the first psychiatrists who understood this fundamental flaw in the method of psychiatry and pointed out that to help a person heal, you need to treat them as an equal.