I quite like this direction, provided we keep its ambitions modest.
One small concern is that Nervos Talk is not yet suffering from the terrible curse of excessive traffic. So before we build too many elegant little rooms, we should probably make sure there are enough people in the house.
To me, a project log / builder log would work best as a lightweight continuity layer, not as a separate discussion silo. It could be used for milestones, design notes, progress updates, RFC links, test results, and retrospectives. But broader debate, support questions, grant discussion, governance discussion, and ecosystem feedback should still live in the normal public categories.
In other words, the log probably should not become a private chapel for one’s own project. It should be more like a well-kept index, changelog, and map, of a place that preserves context, then points people back to the actual rooms where conversation happens.
That would give long-running work a bit more memory, without further thinning out the already rather precious forum traffic.