[Radio_man]

The London skyline backdrops do work really well in studio C, but no doubt they were dropped from World when the NC & World started simulcasting much more often from C, because the BBC is terrified of being seen as being 'London centric' when broadcasting news programmes to UK audiences.
(Even though Joe public knows that BBC Network news comes from........ London )

That said though, considering the new sets in Belfast and Nottingham (and presumably the rest of the new regional ones) are based on having skyline backgrounds, it could be something they're moving towards across BBC News.

As for the London centric thing, that may be less of a concern given the new news channel will be primarily geared towards an international audience.

Well no one told BBC Wales this, as their new studio, launched in Sept 2020, has a backdrop of their main newsroom, as with E in NBH.
The nation's and regions of BBC News are never all going to have exactly the same studios and look at the same time.

As for a London skyline as the dominant backdrop for the new BBC News Channel, as much as I'd love to see it and it would look great on-screen in C, I can't see it happening, especially if the eventual plan is for the new channel to move into E once it's had an overhaul.
So no doubt the disjointed, blurry fake newsroom in C will be with us until the autumn.