Oh, I don't have any issues hitting it. I just want it to still go off when I die.
Hitting a charged Q depends on where you aim it and the skill level of the opponents. If you charge a Q vs. me, it's highly unlikely to hit as I will be able to read it. But there are many circumstances where you can make it unavoidable. The most obvious is a jungle chase, where it's too narrow to dodge and you tornado your own route (so forwards, towards where you're going, not backwards) and land a full charge with full knock up. Even if they read this, their only opportunity is to let you go free.
The other way to use it is as as 'wall'. So I lock off the entire lane behind someone and prevent an advance or retreat. Again, it doesn't matter if you know what I'm doing, I'm going to trigger the "wall" when you attempt to cross it. I've had more than a few people retreat with 40 HP and die to the cutoff tornado.
So yes, I wish that Q and W had damage back (you could make it Q do reduced damage to minions if waveclear was the issue...) but those are separate issues. All I asked for here was to make sure that Q goes off even when I die, because I already cast it, so it doesn't make sense to have it vanish any more than it did to have Sivir's Q not return. If I correctly calculated where a fully charged Q would hit, I should get it to have it execute even when I die.