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So you have people who might be compensating well enough to be subclinical one year, but diagnosable the next because some change in circumstance has undermined their ability to cope. This makes sense if we are thinking of diagnosis as a system of recognizing needed support but not if we are thinking of the diagnosis as an objective test of an underlying reality.
But what if you can see an observable pattern of behavioural traits, which are not currently causing problems, but have a high chance to cause problems in the future?
A classic example would be a university student with AS features, who struggled socially as a child, but is now doing well in university. We know that university is a relatively easier social environment, and that many people like this will struggle to find a job after they graduate. Doesn't it make more sense to give them help now, to prevent future problems?
For a medical analogy, several years ago, my Dad had his blood pressure tested and it was dangerously high. However, he wasn't experiencing any serious health problems due to his high blood pressure. If we approached it the way the DSM does, he'd have been told he was fine, and then several years later he may have had a stroke or a heart attack and died or suffered permanent injury. Instead, the doctors put him on medication to lower his blood pressure, and as a result, his risk of a serious medical crisis is now much lower than it would otherwise have been.