I assume you're talking about Claude Code, right? If so, I very much agree with this. A lot of this was actually inspired by how easy it was to do in Claude Code.

I first experimented with allowing the main agent have a "conversation" with sub-agents. For example, I created a database of messages between the main agent and the sub-agents, and allowed both append to it. This kinda worked for a few messages but kept getting stuck on mid-tier models, such as GPT-5 mini.

But from my understanding, their implementation is also similar to the stateless functions I described. (happy to be proven wrong). Sub agents don't communicate back much aside from the final result, and they don't have a conversation history.

The live updates you see are mostly the application layer updating the UI which initially confused me.