Good point. Yet another of the "bad instruction" list for me...let your arms hang straight down. Builds in wrist cock, low hands, lots of problems (for me, anyway).
Though I'm not a hitter this is a really good point. I finally figured out that often my left wrist is not level at address or impact. Getting it level (at least I think it is) has helped a lot, I can get my right forearm on plane now I'm hitting the ball almost as long as before my tinkering while I feel I'm really only using about 50% effort (compared to always trying to knock the snot out of the ball.......helps get to uncocked and max. lever extension).