Guild Wars 2

why isn’t there some sort of stealth detection in any of the classes? I think that if there was there would be less problem with thieves

Because giving al the other classes a skill to counter the basics of another would render it useless. There already are AoE skills that can hit stealthed thieves.
And then there are channeled skills which follow and hit even in stealth, but I call that a bug.

See a thief stealthing?

POP YOUR kitten AOE’S.

Is the Solution.