The levels of importance have a specific and defined meaning https://wiki.ubuntu.com/Bugs/Importance
From a user perspective I can see this looks like something that has been broken, but I can also see that from an architectural perspective it is a feature that Nux has never had. Either way it needs fixing, but is a non-trivial architectural problem.
I think it might be possible to increase the size of the unity elements as you zoom. Not zooming the unity elements as such, just making them bigger. If this is synchronised with the zoom level it might be quite a nice effect.