You know I still don't get the argument, I haven't leveled either so please correct me if I am wrong. This is based on the mobility issue.

When there is no mechanics going on, your still anyway so why not embrace the stance to do more dps. If a mechanic requires you to move cancel stance and carry on pew pew 2.0 mode until mechanics are done then back to stance - as far as I can see there is no mobility issue, you should have been standing still anyway when there was no reason to move.