I think tanking needs a redefinition, not just a balance tweak.
✅ Fixing BarrierTanks and OffTanks
D.va is in the ballpark where she needs to be, as evidenced by how she was full meta with the 3sec boosters.
If anything, the main thing that would help D.va is pushing the game to be more Dive focused.
DPS by comparison just needs a few tweaks here and there.
Also hero pools for GM/Masters start back up soon. So that should mix up the meta a bit.