Power creep and ascended gear in WvW
No need for a test it’s basic math. Just yesterday I had a 1v1 with a thief in WvW, which I won. But when I finally finished him off out of downed I had less than 200 health left. If he had had 3 pieces of ascended gear, let alone a whole set, it would have easily turned the tide of the fight.
Most battles will not come down to death or victory on a small percentage of stats difference, but some inevitably will, and every single combat you partake in you will do better (deal more damage, or take less damage) if you have better stats.
These items violate the philosophy of an easy level playing field, anti-grind, and freedom of play, in which you can achieve the gear plateau through any avenue of play you desire. Right now there is only one avenue.