In my mind, there are some easily implemented counters to stealth. One would be that any damage dealt to a target in stealth still appears.
Another would be to add an additional PB/ targeted AoE component to a single skill from each class (perhaps those skills typically not taken) which would remove the stealth buff.
Example skills:
Ranger: “Guard” would allow the pet to target and unstealth any stealthed target that enters the area.
Engineer: “Elixir S”, or any elixir could have the F2-4 ability also have a destealthing ability, replacing the random stealth component of its existing current boon selection.
Guardian: “Hallowed Ground” could have a de-stealth component.
Warrior: “Fear Me!” has a relatively long cooldown, and is not tremendously popular, and could provide PBAoE de-stealth.
I could go on, but the idea would be to take skills that are not typically used in WvW, such that it is a trade-off between performance and de-stealth capability.
At the moment, a thief on the offensive requires regular, short duration stealth, and these abilities would not impact massively on that. My problem with thieves in WvW is their roaming and escape capability, which these changes could address.
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