I really don't get why they failed with Atma so badly, when XI did it so well...

They really should have made Atma FATE farming more like Currency farming in Dynamis; There is a very low chance an Atma can drop, but there is a very high chance Atma Shards can drop. X Shards = 1 Atma. That way, you still have a sense of progression while farming Atma.