Raid/Dungeon Loot boxes
Currently, depending on your luck, gearing on a52 can feel incredibly punishing and be an incredibly lengthy process.
Having the loot boxes like the league realm had would alleviate this. losing rolls on gear week after week would not feel as punishing and, I believe, help with player retention and interest. with gear acquisition increased, it would give you more opportunity to pursue multiple builds and specs of different gear types with more ease.
I firmly believe the Pro's outweigh the cons of introducing them to a52. after all, the whole reason we're here is to get loots and play fun builds with them.