Some issues with how Instant/Deadly vs Dissolvent Poison/Corrosive Poison now work after changes.
Dissolvent and Corrosive was clearly introduced to make assassination and poison specs viable against nature immune mobs. The issue now is that after changes there's still mobs rogues can not DPS. Example drakes from the green dragonflight they are nature immune and aren't a mob type that Dissolvent or Corrosive can DPS.
Dungeons are incredibly annoying now, you either need to bring stacks on stacks of poisons and swap a lot, DME and BM are a hell for example and MC is even worse. Or have 2 weapon sets and swap between them.
The change was clearly made (nerfing the QoL of the poisons) for PvP purposes, can't dissolvent + corrosive get rolled back to it's previous state but make them not work on PvP players.
This way people still need to use instant/deadly/wounding/cripling in PvP but in PvE rogues don't have to swap poisons before every pull (yes MC is fucking terrible).