Yep. "Threaded" might be what the kids are callin' it nowadays. It's always been trees for me. I had a 'Tree-based' chat app for OpenAI (and as of now all other leading LLMs, via LangChain/LangGraph) within one week of them opening up their API. lol. Because my Tree-based CMS was already done, to build on.

OpenAI finally made it where you can go back and edit a prior response, in their chat view, but their GUI is jank, because it's not a tree.