Patients generally can't be relied upon to be objective. There may be exceptions but patients will often say they don't have symptoms that they do and that they do have symptoms that they don't.

Speaking as a patient myself.

I wish there was a way I could get an objective test that spits out exactly what's wrong with me and which treatments are most effective. I've been through several psychiatrists and treatments and am yet to find something effective.

I'm glad research like this is being done.