Symbols panel / Quick apply formatting
Not sure if this suggestion lives under styles. What I'm thinking InDesign needs is a feature like Illustrators symbol library where we can take a group of pre styled objects and define them so that they can be easily dragged back on to the page rather than continually copying and pasting from other parts of a document on to then overtype or swap out images etc. as you build documents consisting of replicable structured content.
Functionality would need to be like Illustrator, a simple drag and drop interface on to a panel. So that any images, shapes, text frames, styles. colours etc are captured into one grouped object that can then later be recalled at will. Ideally through hot-key activation.
Then the link can be 'broken' to it's source so that it can be updated with new content.
Scott Falkner commented
Is this significantly different from the Library feature?