It's been well documented how many features were missing when FCPX was initially released. Apple has done a decent job of adding many features back that editors clamored for before they would remotely consider using X.
But Apple has still left many holes it expects third party developers to fill. It's possible Apple will eventually replace or modify features that editors live by in broadcast or feature environments. There's no telling really. I have a hunch that, from here forward, Apple will continue to let developers take on the features that either a) Apple still deems part of the "old workflow" or b) that Apple would like to have us think FCPX can take care of itself (a good example of this is color correction. FCPX's color correction tools aren't bad, but I wouldn't necessarily grade a feature with them).
Before launching into a feature film with X, we needed to determine we could take our edit to the next two stages of the post-production workflow: Export for a professional color correct and export our sound to
Avid Pro Tools for a professional sound mix.
The first question was answered fairly quickly:
Da Vinci Resolve can import FCPX's new XML file format natively. I've read in forums that there are have been a few issues that have come up for folks that have utilized this workflow, but that overall its fairly smooth.
Less straightforward is how to get your sound to Pro Tools. In FCP7, the editor would (ideally) organize the soundscape by placing different sound elements in designated track assignments. Then you would export directly out of FCP7 to OMF. Sometimes if a feature's soundscape is complex, it would require several, well-labeled OMFs to get the job done.
You can't export OMFs out of FCPX. Not without a little help.