On one hand i clearly agree with you about the overmedicalization issue, on the other hand there also was an undermedicalization going on for centuries, especially in the autism/ADHD/etc fields. It's a tough balance to get, cuz the rise of diagnoses may not indicate an overmedicalization, but rather a correction of the undermedicalization (though the risk of overmed. is real, clearly).

And on the medical condition being part of an identity, i also get your point, but it's also important to consider that making your differences part of your identity makes perfect sense, and for a lot of people their differences come from medical conditions. Conflating the two may be slightly unhealthy, but far less than repressing it as non-subject.