The only practical use I've found for knowledge base / bookmarks is to have a searchable list of references/docs/cheatsheets/examples that are hard to find via google (or are not available on google,i.e. internal company docs).

With the release of ChatGPT my need for a knowledgebase has decreased by 10x. And I assume that the need for knowledge base/bookmarking solutitions will disaapear completely in the next few years as LLMs improve.