Why not change Veigar E warning to .25 second to stop instant stun

The toxicity with Veigar's E has always been the instant aoe stun. Why not keep the .25s cast time and then change the additional .75s warning particle to be .25s instead? That way, people can jump out of the instant stun zone, but Veigar can still be rewarded for using it intelligently? You're still talking about a full half-second delay before it's active from when the player presses E, and using A fit engages can be dodged, but at least it allows for some small measure of E use other than depending on brain-dead opponents.