Wtf? A sub-agent is a tool you give an agent and say "If you need to analyze logs delegate to the logs_viewer agent" so that the context window doesn't fill up with hundreds of thousands of tokens unnecessarily. In what universe do you live in where that mechanism somehow means you need fewer humans?

Do you think this means "Build a car" can be accomplished just because an LLM can send a prompt to another LLM who reports back a response?