Re-vamping several passive vulnerability traits to offer more distinct opportunities or create synergy with other traits (rather than being standalone). At small amounts vulnerability doesn’t feel good and adding more vulnerability to something that is capped on it has little value. These changes will offer chances to spike up vulnerability when it is ebbing or encourage new build styles.
Elities are not rotational for power Rev in PvE and are situational in PvP. I guess nerfing rev every balance patch is Anet staple now.