Request: Make Sion's Decimating Smash cast when it gets interrupted instead of cancelling it

This is crucial, and not even funny at this point. Sion's Q is so easy to cancel that it's effectively unusable in team fights. It takes just one stun or silence or displacement and suddenly it goes on cooldown (even though a reduced one), the mana is wasted and it does nothing. Changing it so that instead of being cancelled, it just casts with the power it had charged when it was interrupted would make it far more reliable.

"But", some say, "it does so much damage!" Yes. When fully charged. And the damage can still be nullified by moving out of the way, which any champion with a dash can already do anyway. It's already easy to shut down Sion's shield with like one spell and to dodge his ult if you have a dash or a blink, there is no need to be able to completely nullify his Q by having Riven, Singed, Garen or Vel'koz on your team. Or over half the champion roster while we're at it.