It's certainly true that nervous systems do quite a bit more than language processing, but AGI would presumably also have to do quite a bit more than just language processing if we want it to be truly general.
In the safety literature one frame that is relevant is "Agents vs. Tools/Oracles". The latter can still do harm, despite being much less complex. Tools/Oracles are unlikely to go Skynet and take over the world, but they could still plausibly do damage.
I'm seeing a common thread here of "ChatGPT doesn't have Agency (intention, mind, understanding, whatever) therefore it is far from AGI therefore it can't do real harm", which I think is a non-sequitur. We're quite surprised by how much language, code, logic a relatively simple Oracle LLM is capable of; it seems prudent to me to widen our confidence intervals on estimates of how much harm they might be capable of, too, if given the capability of interacting directly with the outside world rather than simply emitting text. Specifically, to be clear, when we connect a LLM to `eval()` on a network-attached machine (which seems to be vaguely what OpenAssistant is working towards).
> That would only be possible if Sydney were actually intelligent or possessing of will of some sort.
Which I read as claiming that harm is not possible if there is no actual intelligence or intention.
Perhaps this is all just parsing on my casual choice of words "if it was able to make outbound connections it very well might try.", in which case I'm frustrated by the pedantically-literal interpretation, and, suitably admonished, will try to be more precise in future.
For what it's worth, I think whether a LLM can or cannot "try" is about the least interesting question posed by the OP, though not devoid of philosophical significance. I like Dijkstra's quote: "The question of whether machines can think is about as relevant as the question of whether submarines can swim."
Whether or not these systems are "intelligent", what effects are they capable of causing, out there in the world? Right now, not a lot. Very soon, more than we expect.
That aside, I also wonder about the source for the "nowhere near as complex" claim. Per Wikipedia, most insects have 100-1000k neurons; another source gives a 400k number for grasshopper specifically. The more interesting figure would be the synapse count, but I couldn't find that.