As has been explained in the past, the flexibility point would be valid if the breaks were designed to conform to points of stress or buckling, but they're not. They're designed too look like techy junk. There aren't a lot of places on the leg that require breaks, and even if you add a couple of breaks just to be safe, you don't wind up with TDK legs. Adding a bunch of superfluous breaks where there's no reason to do so won't create extra mobility, and designing them to look like angular, technological nonsense won't, either. If the breaks were designed in a way conducive to mobility (such as in Wams drawing), well, there would be no problem (or, at least, the problem would be significantly marginalized). As it stands, it's just nonsensical, unnecessary, and unpleasant.
i disagree. i think they are designed to provide maximum mobility while also looking like "techy junk". when bale crouches or bends his leg the flexible and presumably stretchy part of the suit (the mesh) will bend and give but the rigid parts will not bend becasue they are much more um rigid. but the space between the rigid parts will expand and contract along with his movement so the "plates" need to fit together but never touch. they look interlocking because they are designed to move
Ventilation (for Bale's sake, not for story purposes) is likely a valid point, but as explained by the Guard, ventilation is mostly needed in the neck and head, not the extremities. And, in either case, I'd rather Bale sweat a little more than wear an ugly suit.