Especially the dynamic / collapsible sections are handy; the blueprint is very large (landingspage with tons of options) and with this feature you can navigate quickly between the sections. It’s all done with javascript, no core files changed.
There is also this plugin by @twirx which adds the possibility of tabs to blueprints. It works really great, and I prefer the section-navigation (as tabs) to be at the top, rather than accordions – but that might be just my taste.