> Opiates are a pretty terrible choice for an antidepressant for multiple reasons.
You've failed to present this. That opiates are bad is just dogma left around from the first religious-linked anti-drug pushes. I think they are inappropriate, but in the same way SSRIs are inappropriate, and have explained my position.
E.g. a UK study found that if you just give people all the heroin they want they quit after 2 years. There are no other complications than constipation.