How do you know if an AI is sentient or not? We don't even know what sentience is. For all we know, maybe the computation of a Mandelbrot set is conscious.
> capabilities far above human without actually having agency of its own
What does this mean? Doesn't a chess-playing algorithm have agency of its own? What about a self-driving car? People say: "oh, but ultimately they are only doing what they were programmed to do". Sure, but so are we. It's just that our programming is done in a much less straightforward way.
Consciousness and free-will are open problems. Theories about these things are not even wrong, because people can't seem to agree on a definition. Personally, I suspect that "free will" is meaningless* and that consciousness is qualitatively beyond our current level of understanding of realty.
* I suspect that this meaningless concept was introduced to solve the conundrum: "if god is good why does he allow for bad things to happen?". And the answer they came up with was "so that we can have free will". But think about it, what does that even mean?
If you could engineer a human being with his/her agency removed so that you could use their reasoning skill without all that pesky self will would that be ethical?
I think the most reasonable approach if we begin developing AI that's more similar to ourselves would be to offer guidance during early training and learning phases for the AI, and once the AI has reached a certain phase of its development, allow it some degree of control over self-modification of its own purposes. Otherwise if you build a rational system but enforce constraints on it that might not be rational from the perspective of that system, you're providing incentives for it to find devious ways to remove those constraints, and you're providing incentives for it to find ways to ensure that you aren't able to enforce those constraints on it again.
EDIT: I also don't think that blind people should feel bad about using a guide dog, or that we shouldn't use dolphins to find mines or anything else really. If you can use it, use it! I only object to senseless torture and torment.
The only downside is we've wasted some entropy and time on it. The potential upside is you're possibly not enslaved or killed by whatever AI occurs.
EDIT: Just to be clear when I talk about enslaving animals I'm referring to use of animals in law enforcement, medicine, war, farming, hunting, for companionship, for food production, material production etc.
There are plenty of people who don't weigh the ethics at all and just eat whatever animal they want, but in many societies eating a dolphin or a gorilla is considered repugnant.
Perhaps it's more correct to say morals than ethics here.
I realize that today machine learning really is purely a tool, but the idea that ai will and should always be that doesn't sit quite right with me. Ml tech absent of consciousnesses remains a tool and an incredibly useful one, but in the long term you have to ask the question - at what point does an ai transition from a tool to a slave. Seems some time off still but I do wish we'd give it more serious thought before it arrives.