How attunement works in Destiny 2: Into the Light

Destiny 2's free Into the Light update has launched with six of the 12 classic weapons that are being reissued with new perks for this release. But not all iconic weapons are created equal. What if you'd rather earn new rolls on the now best-in-slot legendary grenade launcher Edge Transit over, say, the Succession sniper rifle? Is that such an unreasonable request?..
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