IMO nothing touches opiates as far as addiction potential goes. That shit becomes as important as food, water, and sex to an opiate hijacked brain.
Still, yes I think they should be completely legal. Legalizing these drugs would completely destroy the black market for these drugs and greatly mitigate deaths from shit like fentanyl and carfentanyl.
Like yes. I don't think Krokodil should be available to 5 year olds. And obviously things like the Opium Wars in China showed that drugs can have disastrous effects. But then we rapidly go down the path when we realise that if we ban, say, Meth, we must also ban alcohol on the same criteria.