The mounted handgunners in the French 1484-1500 AD list have the period-correct armet and more plate coverage than the MaA:

Here's a picture of the evolution of medieval and Renaissance armor from 1100-1610 AD (image was a screenshot from a YouTube video by Metatron titled "Medieval Weapons VS Roman Armour: Would Roman Armour Keep you Safe?"):

I understand if there are technical limitations of the engine, or financial/time constraints on changing the artwork. However, it is a bit jarring and immersion-disturbing to see this, as it would be to see (for example) modern-day infantrymen in combat wearing World War I uniforms and helmets, carrying bolt-action rifles.