With the armour that was introduced it makes little sense to not have adept versions of weapon drops. If I can get adept mods from it we as a player base should get weapons from it aswell. Just a thought.
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They won't and they already said that they want to diversify master content rather than just being (Adept Weapons Piñata™). Hence why they decided to give Artiface armour instead, I would expect Adept weapons for the next dungeon they release but not for Grasp of Avarice at any point.