My main is not fully battened but it is loose footed. The foot itself is slack when the outhaul is tight. This allows the foot to take up the curved shape of the rest of the main which is an advantage over those sails with a bolt rope where the foot is a straight line.
I suppose it depends on how much slack you have.
Edit. Sorry. The foot isn't exactly slack but it is curved compared with the boom depending on wind strength and tension.