It saves them money, they only need to balance a few items and it makes it easier to spot potential issues with exotics being too 'hot'
Avant garde and the dlc bonus do a similar thing for the rest of the legacy gear, Bungie can ignore it, no balance pass required when its redundant.
The whole dlc reeks of minimum effort, cut corners and all in recycled content.
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This is their entire structure now. How little can we do and still keep the lights on. The sooner people realize this and stop handing them money the more likely the game will have a future. Though at this point it's not that likely either way.