it's point one of the biggest fail of the atma, even if you do book you will need to wait to get the weapon in animus for get the damage of a weapon ilevel 100. meaning the weapon will be less powerfull than levi weapon or twin. simply because instead to give the boost of damage with the atma farming they make us wait to have finish ALL the book for get this boost of damage.

actually Atma weapon is a disappointement, indeed at term it will be one of the strongest weapon of the game. but right now, if you look at the time sink it is and the reward you get... it's simply not worth the time. and i doubt that even with the 2.25 it will change, simply because for now SE have put raid before everything, Crafting and relic take more time... but still you are not rewarded for your hard work, because they think that raid content must be the most rewarding.