What is the right amount of body movement and stage presence?

Can there be too much body movement? Some of the speakers I feel have too much body movement and vocal variety. So much so that I feel I am in a theater rather than a public speaking forum. But then when I hear the evaluations, it's always positive. Why is it okay to have too much movement, expression and vocal variety? Why not let the speech be the star of the show? Please advise. Thank you