factActually what you heard is not BS, on the contrary of what many seem to think here. Go ask a podiatrist - you can (notice I did not use the verb "will") develop arch problems because there is nothing supporting the arch of the foot when playing barefooted. Some people who play hard even get bruises on the ball of their feet.
Just like one should use good technique with his hands in order to not hurt himself, the same goes for playing barefooted.
how many dissenters here can prove their thoughts more than the contrary?