What does magic look like? No one knows right? However we all have a picture in our mind of what it should look like and it's always different from person to person. One will think that something appearing should fade into existence. At the same time another will picture it just blinking into existence.
I don't think anyone will argue that the former seems more mystical or mysterious. The problem with the latter is it can very well end up looking, well... mechanical.
The problem is we have seen things move faster than our eye can track. It can easily be dismissed by a certain "something". Sure it might still get a reaction but I'm not sure it looks magical in the end. I have seen a few tricks on the market that suffer from this mechanical feeling. It's like a sleight done too fast. It will look like a move. How do you fix this? Perhaps with a wave of the hand or a magical gesture or some moment that looks like YOU caused this to occur and not a rubber band.
To each they own...