Interesting take! It does seem to address a typical "intermediate" workflow; even though we prefer linear finished products, we often work by completing a hierarchy first. I've been using Gingko [1] for years, I find it eases the struggle of organizing the structure of a problem by both allowing endless expansion of levels, and easily collapsing it into a linear structure.
In your case, do you hold N contexts (N being the number of leaves in the tree)? Are the chats disconnected from each other? How do you propose to transition from an endless/unstructured canvas to some sort of a finished, organized deliverable?