Rika's Claw is okay for use for Vol Opt 1 Gizonde trick if a player doesn't have any higher ATP weapons, but the main use for Rika's Claw is to ledge drop in Seabed as a male Hunter/Ranger character.
Does this mean those who currently have Dark Falz Buster can use for now but later on the weapon will be entirely removed from the game so no one will have one? If so, I'm fine with that.
Claire's Deal is broken anyhow. After you attempt to trade in items for a specific item from the NPC, it will not be added to your inventory. Thus, all items you attempted to trade in will be deleted and you get nothing in return.