I agree that results transparency is a major problem and results in the marketplace looking like a graveyard of potentially abandoned / unfinished projects to an unaware observer.
Here’s a fix proposal: Tag topics with “completed” when they are completed.
Another thing that could help is if topics got tagged with a “t-shirt size” to give a quick estimate of how much effort it will or did take.
Excuse the profanity, but this recent tweet I made is very relevant to this: