I always underestimated how not only useful communicating is to a spectator is to covering moves but also to make performance more entertaining.
Top change is a bold move, yes, because it is not invisible. But like anything visible, it can go unnoticed when communication, body movement, and technique are synchronized properly. Everytime you address someone directly, they tend to look back at you, and when people focus on something specific, the brain does not process anything else, so you can pass a lot of things unnoticed... a lot!
Ever seen this?
I realized this the first time I performed 2-card monte. The last change is a top change, just after faking the card change in the spectator's hand. Once I made the fake change, I put my left hand (holding the deck in dealer's grip) above their cards palm facing down and say by looking at them "don't look at your cards yet and tell me which card is which". Their eyes immediately go up, away from the cards --- in fact their eyes go even higher like most people do when accessing their memory. The deck is now very far from their line of sight, at least 70 degrees angle away --- anything they see around the cards with be blurred at best. I now draw back my left hand, rotating it palm up, and preparing for the change at the same time --- right hand does not move ---, as the left hand passes by the right hand, the top change occurs. It will be as though the right hand did not move at all.