Aatrox Q dark flight can be cancel by any Champion in the game

Aatrox Q dark flight can be cancel by any Champion in the game even after he lands in his target. i play Aatrox a lot but sometimes i think his Q is the worst Ability in lol game FOR Example: when aatrox play vs vayne top lane vayne can cancel his Q with her E any time even after he reach her she can cancel it and there is no damage to her but the damage is for Aatrox because her E . and that happen for me happen for me many times.not only vayne trundle, caitlyn, draven...ect and that is not the worst thing the worst thing is that his Q don't refresh like Sion's Q after its stopped buy stun Ability like Riven W. so i think that is a really a big bug. but if riot want him like this i think his ََََQ is a waste A Ability, so i think riot there is 1 we need from you 1/Either you make his Q refresh like Sion's Q or 2/make him reach his target and then the fx of the Enemy hit him