It's not the hands, it's just about every attribute out there EXCEPT height.
In fact, of all of the things evaluators look for in a QB, height should be the least important, and I felt this before Wilson was drafted too.
My reasoning - a very good example can be taken from my experience yesterday where I was at a music festival. I'm a few mm short of 6'2, however, in a crowd of people at a gig, generally this means I can stand where I want and see everything - until anyone 6'0 or taller stands directly in front of me, at which point I need to shift a a few inches left or right because their head is in the way.
That's fine, but considering the average O-Lineman is around 6'4, plus an extra inch on top due to helmet height, realistically you need a QB 6'9 or taller to comfortably see OVER other linemen, the majority of QBs fall in the 6'2-6'5 range, and so need to see between where they stand to find WRs.
Now don't get that confused with the fact a QB needs to be able to throw the ball over the hands of D-Linemen - this is because of delivery rather than height though, a short QB with an over the top delivery will almost always be able to clear those raised hands, however that's rare skill for QBs too, and you'll find a lot of taller QBs get away with having a poorer delivery due to their ability to get away with it thanks to their height