I was immediately wondering about this too. All the note information is there somewhere in the program, so it should be possible to have midi export if they want you to have it. The Orchestra (Sonuscore) didn't have midi export at first, but it was added later.
If the Orchestrator already has midi export I am surprised it is not mentioned in this walkthrough. I don't like the cookie-cutter approach to voicing chords and assigning rhythms, but if I can tweak the midi later it would be useful (at least for sketching/composing/experimenting if not for final orchestration).
Perhaps if you mute all but one instrument you can take that and tweak it in midi. (if not, I suppose in audio, of course.) We'll wait and see.
It only reassigns notes in the chord you play, but if you want a note to alter to a non-chordal passing tone you have to carefully play that with your right hand, but even then it must always be in the right position (top, bottom, middle) in your close voicing. So this is rather limited in terms of composition. If you are writing a separate melody over the top of a preset you may want to move a particiluar tone to avoid conflict or harmonize the melody, etc, and midi export would enable you to do this quickly.
Personally, it is unlikely I would ever use the presets unaltered in a final mix, even if it is not reminiscent (copied!) from an obvious source, but simply because I know others could use it at anytime and I will be unoriginal sooner or later.
But I am excited about making my own presets, and will certainly have fun messing around with it.