It's a bit strange to call it a dead end when this was trained on just a single NVIDIA GB200 NVL72. LLMs couldn't do much back then, either.
The only way around that would be to somehow get all world knowledge and tool calls into a audio space, which seems like quite the stretch.
It seems quite easy? They have the natural language bit nailed, they just need to convert the text with it. And it wouldn't be hard to extend architecture this into outputting tool calls.