I take your point that diagnosis is problematic. The [3] source you’re quoting is basically demonstrating that chronic exposure to a dopamine agonist leads to

I take your point that diagnosis is problematic. The [3] source you’re quoting is basically demonstrating that chronic exposure to a dopamine agonist leads to downregulation, which isn’t exactly surprising. The sentence immediately before the one you’re quoting is a very important qualifier as well. No snark intended, there’s so much out there that the best resource I know to recommend is the citations section of the Amphetamine Wikipedia page (ex: https://jamanetwork.com/journals/jamapsychiatry/fullarticle/1485446 https://jamanetwork.com/journals/jamapsychiatry/fullarticle/...).