The problems with mission farming are:
If you don't turn a mission in with Pirates of the Burning Sea Gold, you can never progress to the next mission in that particular arc. It stalls the game. We want players to be progressing through mission arcs and storylines, not stopping at the most lucrative parts to repeat them.
Once you know about Just One More Time, you lose the choice of working for a different trade faction. This is huge, and not only locks you out of other content, but other rewards and storylines. We want choosing to side with a Faction to be a meaningful decision, not just based on which one has the best mission to farm.
Once you find the single most efficient mission, that's the only one you play and it stops being fun.
We want to reduce the desire for players to farm missions, and one of the ways we accomplish this goal is with reduced loot in non-repeatable missions. We want you to turn those missions in, see the rest of the story, change factions, etc. We want to reward you for completing a mission, not for farming it. So, in 1.15 you will no longer get loot f Aion killing NPCs in missions. This does not affect loot dropped by NPCs on the
Ideally, we want to provide players with readily available sources of both income and enjoyment without putting a roadblock in a big story that says "farm here." Repeatable daily missions with big money rewards are intended to be replayed and there's a lot of variety in those missions to keep it interesting.
