That is just the latency issue. In WoW if you were lagging you could still have a couple of seconds wait for your skill or spell to start doing anything after you pushed the button. Experienced that constantly while under Iraqi internet. Man that was horrible... Since the servers are in Japan, basically anyone not in Japan is going to have that issue unless they come up with some other way of reporting actions and loading menus and windows.
I guarantee no one in japan has any of that lag with menus or actions. I have seen it, because they can walk up to a battlewarden after the fights over and already be teleporting back to camp, and I will still be at the reward window. All the window loading, actions, etc, its based on our latency to the servers in japan.

I can say that in WoW, at least opening our own menus for bags and character and whatnot and such did not depend on the latency. I hate this about FFXIV and I hope they change it soon.l