Finally Yoshi... Finally......

Official response is out:
Q2: You have said that in FFXIV: ARR, the character's position is checked by the server once every 0.3 seconds. However there are times where the character receives AoE damage even though the character on the screen is outside of the range. Seems like the information on character's position is not up to date. Is there any plan to make an adjustment to this?

A2: If we apply faster response times in all areas, the load on the servers will be too much. Therefore, while it will only be for certain areas (for example high-level content and the Wolves' Den), you will be able to notice the faster response times. Please stay tuned!

http://forum.square-enix.com/ffxiv/threads/121315