Be able to zoom the UI / character sheet bigger without affecting PDF export or printing.
I personally have two QFHD / UHD '4K' monitors and it is nearly unusably small, only able to use it on the lower right hand corner of the left screen, where it is closes to my eyes. I can mitigate it by increasing font sizes in the options, but that really screws up PDF export and printing.
There are 11" and 13" laptops coming out with 1080p and 1440p screens, which is why I mentioned FHD. My 17" Alienware laptop has a 2160p '4K' screen..