He's right. Unless you have a pretty pimped out machine, you notice a difference in how smooth the game runs on a lower resolution. I know of people who have a potential resolution of 1080p, but are choosing to run at 720 because the game is much more playable. If you computer is new and built for ffxiv, then you should be able to run at 1080p either without problems, or fixing the problems with config adjustments such as shadows and rendering. Some of the options are pretty confusing whether one should raise or lower them, but I remember SE released an 'ask the developers' or something like that where they explianed how each option affected performance. It will really depend on you video card, and maybe ram. I have an ATI 5850 with 8gb of ram and it runs at 1080p fine.