Well first they said they were making the combat faster, so that knocks out one of your points. Then they also said they wanted to incorporate a good PvP system in this game, so i doubt that having latency unbalance between different regions would help this matter. Then when competitive content appears, the speed of which actions are taken out does actually affect one's gameplay. No, I would have to say latency is important considering the path this game is taking. I mean, we've already seen the outcome of it in Ifrit Extreme. While it is still definitely possible to be beaten, you can't deny the fact that the regional latency difference makes it easier on others.
I don't understand why people are so against it. Some servers are located elsewhere, some are located in Japan. Why do they all have to be in Japan? If you ask me that's just selfish. Even if most people don't go to a global server, doesn't that mean that keeping them all global was a bad idea from the start?
While this is definitely true, this no where near means that it has no potent affect toward's one gameplay. Ifrit was obviously taken into consideration towards the poorly built foundation of the game, yet we've seen the difference that regions has placed on it. A simple separation from the east coast and the west coast makes almost no noticeable difference to an MMO player. However have you ever seen the difference between an east coast player playing a west coast server, and an east coast player playing in an oceanic server? I have when I played two different servers in Dragonica. The simple fact that the server located so much farther away made it so that some of the "rapid" skills in the game were not able to be used because of the delay experienced.
I'm not saying that close to nil latency is required, but I am saying that it is easier to work on something when there isn't as much latency unbalance. We've already seen how happy people were when XI moved some of their servers over to NA.