Terrifying. I just don't see how this doesn't inevitably lead to brain-scale organoids. The ethics of it seem impossible. Given how we treat non-human animals this reminds me of the torment nexus meme.

One of those research areas where nothing they currently do is unethical, but also nothing they currently do is useful, and right about the point where it might ever become useful is also the point where it becomes hugely unethical. So we'd do well to outlaw it right now, but seems like we don't really have a moral framework for cases like this.