It would be very helpful to have citation networks available for Logos books. It would make it easier to prioritize the order in which you purchase the works referred to in a catechism or theological work, for example, especially if color-coded as owned, available in Logos, not available in Logos. It would make it easier to judge whether a book by an unknown author is apt to be of interest - the more references to authors you have enjoyed, the more likely this work is of interest. And, of course, it also supports tracing the history of ideas and arguments for the researcher.
Vote at Build a citation network of Logos/Verbum resources | Logos