Typically, the use case is to import chords from a BIAB chord chart into the clips in Ableton or Bitwig's Clip Launcher view.
In this view, you work by song section, not globally on the entire song.

Personally, I struggle to understand why some things are possible in the plugin but not in the standalone version of BIAB (for example, using the C7 button to export basic chords only in the plugin), and vice versa (selection support only in the standalone version).
Switching between the plugin and standalone tools isn't very smooth...