When Did The Roman Army Standardize Using Plate Armor?

[CaesarAugustus]

But, I think you have forgotten by purpose the real advantage of the Segmentata: the greater protection level on covered parts.

This is a myth that needs to be squashed. All types of metal armour - mail, scale, lamellar, segmetata, etc. provided similar levels of protection.

Do you want to squash material science books? They will explain you in detail why you are wrong on the full topic. Different materials offer different levels of protection. And different shapes and assemblies offer different levels of protection. Each discontinuity reduces the ability to distribute the impact, that is, it concentrates its force. The mail is the one that has the greatest discontinuities, that is, it is the worst in dissipating the impact.