That "significant impairment" language is common in psych diagnoses, and it is indeed problematic. It can go the other way too. I'm getting an eval for high-functioning ASD in a few months. My impairments are significant to me, and have made it a challenge to function in the world--but alas, they are not as glaringly obvious as those in a low-functioning person. There is a tendency for psychologists to shrug and go, "Well, you're getting by, so ..." :/