Lorica Segmentata and Lorica Hamata isnt made from bronze.
So? Still, you think you could survive a hit of a side sword to such an armor when calling it the best of yours if you go by roman armor only? Nah... just because we have asian armor in (and ONLY because it existed beforehand, if it didn't it wouldn't be in, and you know its kinda difficult to remove it after people used it for about 2 years and probably many people loomed it as well, imagine the QQ, even after the black armor got replaced...), we shouldn't ruin it more ("ruin" in saying, Knights already fight Ninjas and Samurais, not making the game better if they would also have to face the romans now who are already dead since more than 900 years and even more (if you compare the armors by time))....
also if you mean those armors being in the mod "mount & gladius" for example; they look really awful. Even if we were going to add roman armor, I wouldn't take those ...