Well I can understand why you would want the feature. But that would limit the usefulness of Nuage in several ways.
1 you can choose to view different information in screen compared to what is selected.
2 you have dual block mode where you can see two tracks at the same time.
3 you can use multiple Nuage fader units and they need to be able to show the channel setting needed locally on the board and not based on track selection.
So there are good reasons for the way it works. However I do understand frustration that it doesn’t work the same as it does in the program.