Stats from artifice armor are lower across all sources besides Grasp of Avarice.
Before Lightfall, we used to have artifice armor with good stats, most of the time higher than 64+. Since then, all sources that drop artifice armor drop, most of the time, armor that are less than 64, even hitting 58 total.
I don't know why Grasp of Avarice is the only one that has not been affected. Artifice armor drops from other dungeons or competitive feel worthless compared to focusing an engram with Failsafe at this moment.
Had farmed GoA Master Boss some time ago and got a 48 stat roll, then just thought to myself "ok, that was it for me..." and then I stopped farming and just accepted my fate XD