Never understood the desire for climbing...all that amounts to is walking into a ladder and going up as if it were a set of stairs. That or the classic "click the ladder and autoclimb" mechanic. Swimming could be interesting but NOT for combat. BRDs certainly couldn't fight and swim...imagine treading water without the use of your arms and trying to fire arrows. Or better...imagine trying to fire arrows underwater. WARs and DRGs wouldn't be able to wield their weapons in any meaningful way though at least DRGs could still kind of be able to poke things. Nevermind that the armor would cause PLD WAR and DRG at least to sink like stones...