I think one of the main drivers behind this kcockayne is the managements desire to get ATCOs working more than one aerodrome simultaneously.
One of the videos I've seen on Youtube clearly shows the ATCO in Sweden with switches on the desk enabling her to select displays covering different airfields.
Also, I think either the IAA or the Dutch have run trials with 2 sets of screens stacked one-above the other, enabling 2 airfields to be controlled by one ATCO at the same time? Again, there is a video of this on the 'net.
I did read somewhere a discussion about what traffic levels/scenarios could be 'safely-worked' 'simultaneously'. For example, could you have 2 take-off or landings at the same time?
Personally, I don't see any of the above as 'enhancing-safety' at all.