Cassiopeia's W and R really need to be fixed. It's been 7 patches for W and years for R.
Is there a reason nothing is being done about these abilities being horribly broken?
The grounding on Miasma often is applied half a second after the poison. The enemy champion sees the Miasma and uses their mobility before the grounding takes effect, reducing Miasma to a zoning tool, leaving her no tools to deal with assassins jumping on her.
Her R is completely cancelled by any form of displacement while it's casting, as well as anything that turns her. It doesn't even affect the direction she's facing in her new position; it literally makes the entire ult do nothing, even though the animation fully played and it went on cooldown.
Come on, this is sad.