It's 'generally' believed that the newer discussion on similar topics would have better material in the light of older discussion(s). Which may not be the truth all time, but that is what mostly practiced and perceived.

Update by author would be certainly better as it will throw the latest information what author believes in the light of his/her new knowledge. It will help wherever people are looking for information.

An alternative way is for the seeker to ask/msg the author about more information that he/she has gained till date and provide other insights in the problem as well. It would be interesting that seeker/author updates the knowledge in node in question or/and add in some other form such as QA. Thus know-how here would help to solve the problem rather than just being a piece of knowledge and monastery would be enriched.

I certainly like the idea of open-source know-how, mentioned by tjh.

artist