I do not like the term "self diagnosis". It sounds like unqualified people playing doctor with themselves.

Diagnosis implies a disorder or illness. I have neither. I do not require diagnosis. Autism may be a distinct neurotype, in fact I am almost certain that it is. But in the absence of an objective test we could perhaps see it as 2 categories: a medical condition requiring diagnosis and support. And as a personality type that has some non-debilitating deficits and benefits from self awareness and knowledge. The former befits from professional diagnosis. The latter benefits from what is commonly referred to as self-diagnosis, but may be disadvantaged by a professional diagnosis.

I am thinking out loud here. Not publishing a scientific paper. Discussion welcome.