It's still a choice to read it again though, right? You can return to a book to read it again in full, which I don't think previous notes will deter you from doing, or you will return to a book for the specific purpose of relearning a previous insight.

Similarly, a Kindle reader can highlight passages and create a note on their Kindle with an "idea" keyword. Then go to your Kindle Highlights in a browser. You can review your notes and highlights on each book you've taken the time to annotate.