Removing Tank Stance Argument

[Shurrikhan]

Every party encounter in the game is tuned around the Tank currently getting hit is in tank stance.

Seems strange, then, that literally every strike allows for the tank's survival without said tank stance. Isn't that the very basis of a tuning point -- to either disallow X, forcing Y, or allow X and thereby discourage Y? If it allows for us to play without tank stance, therefore granting no meaningful advantage to the stance, one would figure that state is what we've been tuned around.