I think a lot of it is the fight dynamics in current content.
As a rogue, you are stuck dealing with a very small part of the fighting area, with the radius for the hitbox on the boss being fairly small, and usually the bosses have large models. This ends up with you staring up at the bosses ass the whole fight. In addition, you are usually in a pile of other melee dps and the tank, with AoE raining down on you, so you can't even see your toon. You need to stay close enough to the boss to be able to hit them, but at the same time the ground is covered with crap that will kill you, with the small hit box radius forcing you to spend half your time running through the maze of fire on the floor, losing time on target as you wait for the tank to move the boss and give you some breathing room. When you manage to get that all worked out, the boss will have a whirlwind mechanic that forces you outside the hit box to lose dps, etc. All the while, you are trying to keep generating enough combo points to keep SnD and Rupture rolling, RvS up, time KS to not get insta-gibbed, and cursing when some mechanic wastes your AR/SB cooldown. That doesn't even include trying to work Bandit's Guile into the equation.
Manage to do all of that and you can lose by 30k dps to a Mage spamming 1 ability and standing back in the clear the whole time. Your reward is spending all those bonus roll gold pouches on repairs.