Is it better not to watch? – Singers in the Recording Studio

Philippe Jaroussky &
Max Emmanuel Cencic

This post started as a complaint about singers who wave and gesture and direct as they sing. It seems only to happen in recording situations. But nearly everyone does it. Anne Sofie von Otter, Elena Garanca, Patricia Pettibon (scary!!), Rolando Villazon, Jonas Kaufmann, etc. (check out any of the promo videos for new recordings.) And these two dudes: Max and Philippe. How do they manage to stand still in concerts?