The one feature of the old Outline project which has not been ported to the core Book module is the ability to specify the depth of the Table of Contents on a book page. I have just upgraded two D6 sites where this is an issue. Where the old sites could display the page hierarchy to a selected depth, D7 limits the display to only the first level under the root page.
Although D7 detects the hierarchy, the only way the user might know that additional content exists below a listed page is the change in the list icon. This is not intuitive navigation, and diminishes the usefulness of the module. Being able to expand the TOC makes sense.
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Comment #1
neRok commentedJust going over some old issues and closing them.
Re your request, Drupal cant please everyone out of the box! This feature would be perfect for a module, or DIY code. Its quite easy to take a nid, get the entire book index and theme to suit.
There is also talk about implementing the feature on drupal.org, and that issue has some chatter, so closing this as duplicate. #1508832: Support +/- expand/contract in Book navigation on Drupal.org