...have a greater number of Vanishs?
I also play Guild Wars 2 and the thief (the rogue in this game) has an interesting and fun mechanic. Mainly in PVP.
In GW2 the "rogue" does not have a permanent stealth that would only end when entering combat... but only some skills that if used put you between 4 seconds to 15 seconds in stealth.
It seems boring and laborious but the advantage is that the Thief has almost a "perma-vanish". In GW2 you can choose 3 specs at the same time from several others that exist for your Thief.
If you choose the "Shadow arts" spec your thief gains stealth in the middle of combat for 4 seconds... just dodge/roll in any direction. Another skill called "Shadow Meld" has about 15 sec cooldown and also gives us 4 secs of stealth. For this not to be fully trolling you spend 50% energy so it's not exactly a perma-vanish. But the energy recovers quickly...
I ask you: Would you like that in the future of WoW there was the possibility that Rogue could also sacrifice stealth without time limit for skills that allow him to vanish most of the time?
p.s: In GW2 the Thief can choose a spec called "dead eye" that allows him to swap the daggers for a long-range rifle.
And keep the vanish skills... yeah... just imagine.
(Sorry for something wrong. English is not my first lenguage)