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Its the problem with GW2 and many other RvR or even PvP games.
When a melee can swing a sword wildly, or an archer fire into a mass, or a mage release nasty AOE death, without worry about killing friendlies, it promotes zerg and removes need for strategic deployment.
Think how much more carefully you would have to plan and coordinate attacks.
Think how much you would have to adapt to deal with stragglers that don't know the plan.
And of course to deal with traitors who intentionally attack friendlies (of course given there is no permanent death deterrant, griefers need a penalty for friendly kills).
But griefer/traitors aside, friendly fire is what is missing.
Explorer 73% Achiever 53% Socializer 53% Killer 20%