I have deliberately shied away from naming names for these "self-conductors" that I'm on about, but believe you me, there are increasing numbers of them about. Most of the younger ones still learning their stage-craft, but I sincerely hope that someone who mentors them will tell them to stop it! But once you've seen it, you'll know what I'm on about.
And as I said before, I'm not talking about Eddie Reader, Norma Waterson, Tina Turner: no, this is a different, but disturbing phenomenon.
And if you want an example of a younger singer who DOES know what to do with her hands, please watch Iona Fyfe: superbly relaxed stance and hands. The singing and song says it all: no need for anything else!