Yes, I also thought this would be a clincher. An integration of Sibelius, Finale, NOTION, or perhaps an agreement could be struck with a less corporate platform like NoteAbility Pro, Lilypond, etc.
The point is that a fully integrated professional notation editor could take say NOTION's notions many steps further. For example, the DAW could conceivably take the composer's performance and the loaded matrices/samples triggered and score the performance appropriately (legato slurs where legato samples were used, crescendi where Velocity Crossfades occurred, octave-runs notated by the relevant patches, sul pont., marcato, en dehors would affect the MIR settings, literally hundreds of possibilities), where minor editing would be required for the procurement of a proper conductor's score and parts.
And more importantly, vice-versa. I know that NOTION is on the right track there, but they have stopped updating their software for a long time now, and frankly it's not Sibelius notationally, which on the other hand is no pic-nic with the sound-sets, house-styles, and dictionaries. I believe a much more musical and user-friendly all-in-one program would answer a lot of prayers and save huge time in the long run... Another example would be that Automation or mixer changes would update elements in the score as well if relevant.
Also, we would have to consider the all in-house advantages regarding overall performance (as happens with Apple software development).
Anyone from the programming wings of the company would care to comment?