Stealth

[Sparky]

Exactly this. This is the reason why there is a skill cooldown for changing classes. So that things like stealth are not OP. Its still useful mining and botany so that mob aggro does not disrupt your gathering but no other class even needs stealth since sprint is so OP. Seriously as a level 5 you can comfortably pass through any zone including level 40-50 areas since sprint effectively makes you unhittable until you are way past the point at which the aggro resets. Try it and see. You get the sight lines from mobs but rarely can they even attack you when you are sprinting.

[Anova]

Following the E3 announcement, the Rogue class and the Ninja job have been confirmed to have some form of combat stealth. I'm not certain how it works yet, but more information should be released as we get closer to the 2.4 patch.