I'm honestly not surprised especially since Bethesda removed levitation and don't want to add it back.
I imagine they are concerned about how the handle it when nearing a city that is in a seperate cell. Of course they can force you to decrease altitude when nearing such a city but you'd still see the ugliness from above.
The same can be said for anything else on the map. The gameworld just doesn't look as good from above. I know some people here have a High-End PC and they'll disagree, however most people are on both consoles or regular PCs. I personally still rather have access to levitation and accept the ugliness and lame restrictions but Bethesda has opted to choose quality of quantity when it comes to features.