AMD 5600x + RX 5700 (will update this comment with DxDiag)
Performance was unaffected after update 3.0.2. Framerate still reaches low 40s in tangled shore, 50s in trostland and 60s in Eventide whereas I can reach more than twice that in most other areas. CPU and GPU usage remains comically low. Shader cache and cvars file were deleted with no improvement.
Rolling back drivers is not an option I'd entertain, specially considering Destiny is not the only game I play. Hopefully iterations of this fix are being considered so I can resume playing more often. Right now performance is too variable to be enjoyable.
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Have you tried disabling SMT (HyperThreading)? That works in my case, but I have an Intel CPU.