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I come from a pvp game where you knew exactly how to counter every single set out there, because you had to and because they all looked unique on each different race/sex/class of characters.
And it also had the same flagging/corruption system as Ashes will. And when you saw someone running towards you, you could tell at a glance what their rough powerlvl was, so you'd also know how you'd measure up to them if they were to attack you. And sometimes you'd make the first attack purely to ward them off of you and make them run past you instead of engaging.
And while what Neurath said is partly true, iirc Art of War said "Know your enemy". And when you're playing a pvp game (a massive one at that), pretty much everyone around you could be your enemy, so not seeing their danger lvls at a glance is bad imo.
Yes, we'll have the buff icon for what your target is wearing, but that is nowhere close to sightreading that information. And when you're against literal hundreds of people during a siege or just during a guild/node war - knowing your preferred targets benefits both sides.
Which is another point btw, knowing what the opponent is wearing works for both sides, while transmogs only serve those who use them.