Yup, no evidence it helps. I don't bother. Why spend time and energy on something that has a very, very low probability of producing positive results? If time/money are limited, spend them on management practices that are known to produce results.
"Know where you stand, and stand there" --Jesuit Father Daniel Berrigan
"There is no reasoning someone out of a position he has not reasoned himself into." --Clive James