This is the key question here. What is a note’s actual position?
From a technical standpoint, the actual position is of course the MIDI data that will be played. This is what Cubase currently displays in Key editor by default.
But what is note’s actual position from compositional perspective? Does it matter that I had to shift notes’ positions so that some articulation with slower attack is played on time? Or that I increased the length of notes, so they overlap, just to get the VST instrument to correctly play legato. Or that I randomized lengths and positions so that the performance is more human?
When I’m composing in the Key Editor these “offsets” detract from what the actual composition is. They make it less clear what the composition is. Or to put it another way, when I am interested in composition, I don’t need to see all the quirks of the performance data.
Of course usefulness of this depends on person’s workflow and experience. This may not be that useful to someone who plays in the notes with a MIDI keyboard and uses the Key Editor only to fix or touch up notes a little. I, on the other hand, work mostly in the Key Editor. From manually inputting notes while composing ideas to adjusting the performance in the end. I find it faster to work primary in just one editor, than to constantly switch between Key and Score editors (just so I can see a clearer picture in the Score Editor). I also prefer the Key Editor for editing. For someone that does most of the work in the Key Editor, this feature would enable him/her to have a clearer overview of the composition and edit faster (because written notes would stay on the grid).