I recall a thread (or maybe an article) about allowing the chambered round to fall into your hand while locking the slide to the rear and they myriad problems with doing it that way instead of just letting the round fall out onto the ground. Most of those concerns make sense to me.
However, Scott Reitz describes this method in his book, with a rationale for why he thinks it is a good idea. He thinks it serves as a check to ensure the round is out of the chamber; since it wasn't in your hand when you got started, it must have come from the chamber. I don't think it negates concerns about muzzle control, but he was the first person I've come across that does it for a reason other than it "looks cool". (Although, to quote Awerbuck, the first rule of gunfighting is to look cool, so maybe that is sufficient unto itself. I should point out Louis was being sarcastic at the time.)
I thought his book did a pretty good job of covering; and explaining, fundamentals of gun handling, marksmanship and mindset and it has helped me diagnose problems and provided things to focus on with my drills.
FWIW
Tony Muhlenkamp