[Walter Soyka] "FCPX's approach is unique, which adds an extra layer of complexity to interchange."
What seems to complicate this is that there's no clear definition between audio and video clips and the nature of connected clips, primary storylines and secondary storylines. In the "standard" approach, it's clearly defined what's audio and what's video and where they go onto either video or audio tracks. And each of those types of tracks have specific attributes and they are defined in the same way for all of the tracks of that type on a timeline.
FCP X breaks these conventions, so as you look at some of the various translation results, there's often little rhyme or reason as to why clips are assigned to the primary storyline or some other place. At the moment, for better or worse, it appears that IA is really the entity developing those specifications. Hypothetically, if Boris came up with their own Xto7 or 7toX transfer tool, the resulting translations might look completely different from those of IA. That's why I think it's important for Apple to take responsibility.
- Oliver
Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com 
