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As you are well aware of, while fighting in WvW you wont be able to see the name of the character opposing you (you can in structured pvp, at least it shows in the videos). Youll be able to see "green invader" , "red invader" or whatever. The rationale for this is that it captures more the feeling of a mass battle in which you fight a horde of faceless enemy soldiers, as opposed to the more ritualized, duelistic nature of structured pvp, in which individual reputation plays a large part. Server turnover and the fact that you wont face the same enemies again in a possibly months is another argument used to justify this. No problem for me. Fighting an enemy with no name does add a certain warlike feeling to the whole situation, but i suspect there maybe another reason of a more technical nature.
If you remove names, you remove the necessity to correctly depict your enemy. If we are going to have 500 people dishing it out in the same instance, one of the limiting factors could be the amount of data your internet connection can handle (this is just especulation on my part). Perhaps the blonde piggytailed female norn thief with red armor you are fighting is a norn and a thief,.....and male , dressed in green and with an enormous beard. Perhaps your internet is only transmiting ...norn... thief...armed with bow and your pc is randomly generating the rest. It could save for a lot of data transmission and perhaps make those battle possibles without too much lag and it could explain the necessity of not allowing you to identify the player.
Please bear with me, this is just speculation and i have no technical savvy, so this could well be a load of BS, but i find the idea intriguing. It it were true, i wouldnt mind it too much if it made the whole thing work more smoothly.