They should've just done what D1 Adept weapons had, which is an extra perk in general. Like intrinsic snapshot sights etc.
Celerity is fine and all but i rarely see it being used as much, the fact that it doesnt work when players abandon the game is also discouraging to choose it as main perk.
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Sadly the engine (even after being "upgraded" for Shadowkeep) can't handle the guns having more than what they have now. Hence why with Witch Queen we're losing multikills generate orbs from masterworked guns. That is if you still believe anything Bungie says anyways.