Can easily turn it around. Not everyone is in your state of mind either. Maybe you can bring a valid point in other MMO's, but you have one flaw to your statement. This is Final Fantasy, meaning, a lot of players are JRPG players who favor a fashionable look, but only wear stat gear because it is better for the events themselves.
I know I don't like the tanking gear I wear right now, I wish I could go all out and make my character look unique. Look back at previous Final Fantasy's, do most of these characters look like they are dressed appropriately for the situation?
Seriously, I used Vaan in FFXII as a tank in the game, and all he wears is this one tiny vest. The point is, this system caters to a large number of people. This system was successful in WoW and Rift. People did not like the new look of tier gear in the game, and wished they could wear their earlier tier sets again. They made the Wadrobe system, and I didn't hear any complaints about it. Maybe one or two people on the forums like you.
Overall, I don't want to see all DPS's in a group wearing Haubergeon like FFXI. I want everyone to come in and have a look that defines them, a look that defines their character. Having everyone in Haubergeons would just make the game feel less creative and generic.