Summary is kind of a cool idea for those bookworms like me who read too many books at once.
Sometimes you return to a book a few months later.
As long as we are brainstorming I was thinking of AI generated custom summary of what you have read.
Sort of combine the percentage read indicator of Kobo with Machine Learning summary robots which have gotten scarily good these days.
These kind of summaries would work better on business type of books than on fiction, but even fiction can be summarized.