You didn't get the point of arena gear. Since gm realeased resilience with arena gear ; they expected players to use 2 different sets : 1 pvp set and 1 pve set.
But the difference between a stuff with resilience and without wasn't enought for the pve. (Resilience is great for pvp, and not totally bad for pve).
They want arena players to use their awards to fight others players, not farming. Since too much peoples was using 17/19/21 arena weapons to store money, they decided to make some drastic changes.
But they were careless about the consequences of giving 40% free extra damages to damagers class ; while supporters class aren't thzt boosted (tought, I considered heal as too strong for a long time)