@glyph @mjg59 I also worry about addiction. As Netflix learned, hours-go-up is likely a bad thing for your business to optimize in isolation, because its usually bad for your customers too. I know my team works hard to avoid that trap.
A lot of that concern is related to my earlier response to #1, but it can also be a great enabler of hyperfocus, which can be both very pleasurable and counterproductive.
All that said, you seem pretty convinced that using these things is like pulling the arm on a slot machine - sometimes you get a reward but a lot of the time you get garbage and have to try again a different way. They really truly are not like that these days in my experience, and have not been like that for a while. If you model them or their users that way in your reasoning, you will be making category errors.
As a user, (and maybe you'll say I have AI psychosis) the experience is more like working with a very fast, very precocious junior who has memorized half of wikipedia and is very quick with google, and who is getting better at writing code, but reasonably often needs detailed instruction or directional course correction. You don't cut their head off and ask the talent agency to send you a new one every time they give you an answer that doesn't quite match what you want, you clarify your request, or ask for a more achievable scope of work. Unlike searching google, your queries compound to vector the agent where you want it to go, conversationally, rather than standing alone individually.