> the advantage of AGI is you don’t need to keep building new software for every task.

Even the human's brain seems to be 'built' for its body. You're moving into ASI realm if the software can configure itself for the body automatically.

> That’s the promise of AGI.

That's the promise of multimodal AI. AGI requires general ability – meaning basically able to do anything humans can – which requires a body as capable as a human's body.