Heh, forget the PHQ-9 this is a very general issue with assessment/diagnosis in the field and a large part of why (for better or worse) initiatives like RDoC and HiTOP came about. Few of our symptoms are specific to the disorders in question and we lack the ability to dig much deeper at the moment. Picture a blood draw showing elevated white blood cells. Infection? Leukemia? Just stress? Its tough.
The general trend has been going on much longer than this and ultimately, I think relying more on quantitative measures is a good thing. The PHQ-9 may not be right for all populations, but what alternatives exist that are good for those populations? GDS is an example, but it sure isn't perfect and that can be inappropriate for older patients in good health with somatic symptoms. For now, I think its just important we rely on people to make good decisions (and collectively as a field, healthcare needs to get better at standing up to the bean counters).
Love your comment/analysis.
I also think that the entire field is on the cusp of re-conceptualizing 'evidence-based psychotherapy' as a MUCH broader playing field or construct than most current systems view it to be. In the VA system, for whatever sociocultural reasons (and I can speculate deeply on these), the term 'evidence-based therapy' (or EBT) has become (in the minds of many) exclusively synonymous with the 'protocol-for-syndrome'/manualized, alphabet-soup-worshiping, fixed-structure/length, pre-determined-agendas, 'recipe' approach to psychotherapy implementation. This is seriously myopic and seriously incorrect. The definition of evidence-based therapy (according to ANY published literature I have EVER encountered [including the APA definition]) has NEVER limited the concept to merely manualized/alphabetized treatment protocols. Like...never. Steven Hayes and Stephan Hofmann are laying out a 'process-based' therapy future that is far more transdiagnostic/idiographic and more in line with a classical 'evidence-based' functional assessment/analysis model from 'old fashioned' CBT case formulation approaches. However, it does require thinking clinicians and a lot more effort than simply 'diagnose and plug/chug the protocol' approaches. Standard disclaimer: I routinely prioritize evidence-based protocols (like CBT-i, PE, CPT, etc.) for clients who are ready for them, receptive to them, and are good candidates. They definitely have their revered place in the palette of treatment options.
The organizational factors behind the exclusive reliance on a protocol-for-syndrome approach (and myopia) likely stem from the 'medical model' [metaphor?] being predominant as well as the frankly, at times, sadomasochistic, authoritarian, top-down 'marching orders command and control' model of 'administration/supervision' prevailing throughout the organization throughout its entire history. The intra-personal/personal factors I will leave the reader to unravel according to his/her lived experiences within the system, lol.
Change is coming to the field and, eventually, to the VA regarding how we conceptualize and implement 'evidence-based therapy.' Unfortunately, I predict that this change will be exceedingly slow and excruciatingly painful (especially for the providers) and likely lag at least 10-15 years behind innovations that will occur within grad school programs as well as the field at large. It will happen long after I retire (20 years from now...maybe?).
When we still have Joint Commission (recently) declaring it 'illegal' for us to have a drop-down menu within our progress note templates to efficiently indicate the clinical observation of 'no suicidal ideation expressed during today's session' for a client--they said it was not 'evidence-based' assessment...pointing to a preference for the C-SSRS (which is just 9 yes/no questions)--then we have reached a level of concrete stupidity that I never, even in my wildest and most cynical days before, would have dreamed possible...even for VA. Yes, you read that right...Joint Commissars (I mean 'Commission [of atrocities]') has declared it somehow 'outside the scope of acceptable practice' of an individual doctoral-level provider to simply note in his/her chart for a specific client that he/she is not currently suicidal without first implementing an 'evidence-based' assessment/script such as the C-SSRS in every session. It is obvious to any sophisticated/experienced clinician how robotic adherence to this mandate would have far more negative impacts than positive, especially on the therapeutic alliance.
[provider]: 'Are you having any thoughts of harming yourself today or have you had any of these thoughts since our last session? [patient]: 'No. I have never had thoughts of killing myself...I couldn't do it, I love my kids too much and I wouldn't hurt them like that...besides, I have hope now that life is definitely worth living and I'm excited to get on with it' [provider]: 'Hmm...okay, I hear ya on that. But, just to be sure [and to satisfy the Joint Commissars], we're gonna need to go through some specific questions on that. Would that be okay?' [patient], 'Umm...okay, if you say so but I think I've made it pretty clear that I'm not suicidal, haven't even thought about it, like...ever, and don't plan to do anything.' [provider] Okay. Thank you for your service/compliance with Joint Commisar and Big Brother...let's begin...[robotically administers the C-SSRS].'
'Thank you, Joint Commissars...may I have another?'
This level of concrete stupidity and authoritarian boot-stomping-on-the-face-of-providers-forever approach is wholly incompatible with where the field is headed and will take a LOT of blood/sweat/tears, gnashing of teeth, and will require decades of patient, careful, explication to the 'powers-that-be' of how not having to robotically read from a script doesn't mean that we are 'abandoning' science or best practices or 'evidence-based' approaches to therapy or assessment to turn around.