Homogenization and Simplicity in Tank Roles

[Absurdity]

I fear you are grossly exaggerating their comment.

The simple act of turning it off made you automatically perform better than half of the tanks doing content without any real effort exerted. Now it mainly depends on how you execute your rotation and your uptime.

I think not.

Simply turning your tank stance off did not make you automatically better than half of the tanks, unless you were already better than them and in that case it doesn't even matter if you're in tank or dps stance.
The 2nd point makes it sound like executing your rotation and maximizing uptime were somehow irrelevant before ShB and all you had to do was turn your tank stance off.

Both points are either vastly exaggerated for the sake of argument or, if we're less charitable, flat out nonsense.