“I confess that I don’t know the wording of the law, but it should be limited to “hard” disabilities like blindness, not crap like “depression”.”
AGREE COMPLETELY.
Using a dog for depression is silly.
If you are so depressed you need to carry a dog everywhere you go then you have problems a dog can’t cure.
And the modern definition of depression is incredibly wide and deep.
Things that people used to shrug off now send idiots running to the doctor for a “cure”.
Like you say, service dogs should be reserved for the hard physical disabilities.
If depression was all it took, everyone walking around Seattle in the rainy season would have a “service” dog. :-p