This seems to be the classic discussion over what counts as reliable. Humans aren't particularly reliable, and as any hardware engineer knows, even if you have provably correct algorithms your software system can never be 100% reliable because cosmic rays and spilled coffee. You can get close via herculean efforts in software and hardware co-design but never all the way. To try to pierce the hype of AI agents without allowing for the surprisingly low bar set by humans across a large array of tasks is to miss the forest for the trees.