They really need to look at there UI as a hole before creating it.
I think this was unintentionally rather funny.

Save space for data shouldn't be a problem.
Too bad, it is. Efficiency is a virtue didn't you know?

theres alot of other stuff they could get rid of for space, such as AF Storage npcs, items, and other things.
And in fact I think the af storage NPCs are redundant with the introduction of the moogle storage slips.

the stuff you're complaining about isn't really a UI issue. UI = the windows and buttons and such. It's not going to change interactions with NPCs, because the old UI still has to be able to work, because the console versions will still be using it, and PC users can switch back to it as an option.