The more I think about it the more certain I am that this is the reason they will not increase the Cue count in Nuendo.
Nuage is their all-singing, all-dancing control surface with full integration with Nuendo, so the users will be pretty ticked off if they cannot access all of the Cue sends in a future Nuendo version due to Nuage limitations.
I’ve never seen Nuage, but if I understand you correctly, it has only four physical controls for cues. This may indicate that from day one they never had any intention of increasing the number cue sends available in Nuendo!
Maybe Timo could clarify this for us?