It's different for every role, but it's most useless on Healer. As our ilv increases, so does the stats attached to the gear. While +30 to our main stat was pretty significant when we were ilv70 transitioning into i90, our now i90 -> 100 -> 110 is making it more worthless. The new level increase should rebalance this (I'm assuming we'll be getting an additional +20~30 more to our attribute points), but as of right now it's meh.

Disclaimer: for a DPS, +30 is huge, and for Tanks it's just as important. For healers, tbh I can see them going into VIT to help with Second Coil until they have high enough gear.