You raise some interesting and valid points, thank you for this post. I do think that screening for less 'biological end-points' are more difficult and analysing the process/results, I reckon, would reveal some important limitations of screening.
I also think with conditions such as 'PTSD' and psychiatric problems, there can also be a perceived and felt stigma that comes with the screening test. Particularly, during WW2, when it might have been less 'acceptable' to be a sufferer of such conditions. Could the actual process of screening help with it? Or could it contribute to anxiety further?
Not entirely related but with regards to screening in general, is there also a possibility of 'over-medicalising' conditions? Personally, I think that the term 'screening' itself denotes a medical process and perhaps negative connatations.
