>>2210745
>>2210739
They wear them because the game seems to have mostly dropped the actual dark age style for a more late dark age - high medieval feel. I mean look at the Vlandians. So the Roman faction is more akin to the 10th-11th century style Romans.

Guess it makes sense, it's only 200 years before Bannerlord and they already have plate armor by that time. Also fantasy game where vikings still exist alongside knights.