IMO, the very concept of rogues is to be stronger in vs and weak in clashes, and I'm pretty sure if we give rogues a way to become invulnerable, or hard to take down, rogues will literally become impeccable, I mean each class has its own role to fufill, and a rogue's role is to take down an enemy in a short period, also, I'm pretty sure the thing that's hindering balance these days is the Dragon hunter's sword proc, which made the warrior class an impossible wall to overcome for any other class.