This sounds like running with the ball, which has nothing to do with passing?
The main downsides are that 1 - you are slowing play down, so allowing more time for the opposition to get into position and 2 - you're trying to keep the ball in an area with defenders, not really known for their vision and passing ability, around opposition attacking players so it may be difficult if there are too many attackers.
Yeah - plus hes at Stoke where the cbs are not really "ball playing" (ie renowned for ball retention). I find that play out of defence is a difficult and dangerous instruction to use properly. One way of lessening the danger of losing the ball in dangerous areas is to instruct the gk to distribute to full backs.