So let me explain why I ask - recently during a lunch conversation at work I mentioned how I've taken my hands off of my handlebars on a local highway. It is particularly flat, there were no other vehicles visible, and as it has been repaved recently there were little to no frost cracks or heaves. I also have a throttle lock.
One of my coworkers berated my until the veins were popping out on his head, citing examples of people doing this and the front end instantly becoming unstable, wobbling, and crashing. I could not understand what he was talking about - my bike is insanely stable and non-wobbly at 60mph, the speed I was going.
I *can* picture how sudden decel without your hands on the bars could cause some instability. I could also see how a bent rim or damaged tire could cause issues. But on a healthy bike that is not decelerating I can't see any reason for the front end to wobble.
Granted I would not do this for very long and certainly not make a habit of it - but I really don't see why this guy reacted in such way.