Not sure what motivation you're asking about. If you mean motivation for posting links to past discussions—it's my job to help HN be as interesting as possible (see https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...), and readers seem to find those links interesting.
https://hackernews.hn/item?id=27726982 (July 2021)
https://hackernews.hn/item?id=27284079 (May 2021)
https://hackernews.hn/item?id=27236708 (May 2021)
https://hackernews.hn/item?id=26886074 (April 2021)
https://hackernews.hn/item?id=26245003 (Feb 2021)
https://hackernews.hn/item?id=26158300 (Feb 2021)
(I made that list using the same software :))