When accessing a module that may may be long, user prolly wants to finish the remainder of module if they select Bookmark.
However, later (ex. the next day) after choosing Bookmark, the option for the module is not there. Also, the Bookmarks are NOT in chrono order.
That would be great if someone chose to halt a module, selected Bookmark, then clicked on Bookmark the next day and picked back up where they left off.
Currently, it doesn't appear that is the flow. But, it may be great to get them to explore something different.