I like riding with my hands off the bars with a bike stable enough to make it easy to lean through sweeping turns. It's one way to take a load off the hands for a bit.
I'll admit, I get my hands back on the bars when people or cars are near. I'd do the same if on a narrow path with other bikes coming towards me.
But if I was a unicyclist, I'd be back to not having any hands on the bars. All the time.