Maybe some would be less deterred by the limited ability to notebend if Yamaha allowed pitch to be drawn on the notes? Notebending can also be used to manipulate pronunciation, dynamics and stress of the Vocaloid voices. These techniques are not prevalent in tuning other AI synths, like SynthV, CeVIO and ACE - or, at least, you don't need to break a note into tiny pieces to achieve a certain effect. IMO, Vocaloid6 doesn't really have enough of AI quality to abandon the heavy notebending tuning method completely. The only part of Vocaloid that sounds AI to me is the Vocalochanger, which is separate from the editor.
I agree it's mostly a minor setback, though.