No one has mentioned the potential for greatly improving writer productivity, as well as eliminating format overrides.
Once authors are up to speed on using the structure view and the element catalog, they're freed from the entire formatting burden (if the EDD specifies context-based format rules). I see no reason why this productivity advantage would diminish for relatively small documents. And, unlike unstructured Frame, re-importing the EDD into a structured document with "Remove Format Overrides" turned on will eliminate every single instance in which authors overrode the EDD-specified formatting. When authors realize this step is part of the review process, they know the jig is up. -----