@adreno perhaps they're practicing resisting perfectionist tendencies out of fear of developing CFS
These retrospective questionnaires seem like a nonsense to me. What are they actually measuring? It's current attitudes about memories of past attitudes. What your current attitude is will impact (eg looking for a reason to blame former self to get a sense of cause and effect, or a positive attitude towards perfectionism as reaction to accusations of laziness "no I like to do things well"). Anyone who's done psychology 101 can tell you that memories are reconstructed each time you remember.
This could only attain credibility as a prospective study eg like the one that studied students who got glandular fever and then followed up to see who developed CFS afterwards. If the ones who got CFS were perfectionist at start of glandular fever but not the ones who didn't it could be a thing.
I thought this perfectionist stuff was done with 10+ years ago?
I can get over invested in one goal though. That might be a perpetuating factor. Eg focusing on one thing to the extent of blocking out warning symptoms and not switching off mentally from the one goal. This makes it a pacing difficulty though rather than a predisposition.