The UI looks messy in that video because the person playing organized it that way.

Not very many games will allow you to move, scale, and adjust your main interface the way FFXIV does. This is one feature that was well thought out. Could use some new features and a lock ability, but overall how the hell can you complain?

If your on screen UI is still taking too much real estate, that's your own fault for not scaling and adjusting to fit better.

other note: video looked pretty damn amazing :B can NOT wait! also need 50 asap