Re: I have nightmares...
@Cycocore you can find information about prosthetics in WW2 on the interwebz. Alot of people had their limbs replaced after sustaining injuries in battle. Also, some officers and troops choose to get back in fight, even wearing a prosthetic arm. Others will continue to serve in logistics.
You could see some really interesting things developed in middle-ages, prosthetics that would look more advanced than the times when they were created. The prosthetic limb from the trailer was developed by Northrop during WW2 for the soldiers that lost their arms during fights.
We should never forget that war isn't nice, that people die, get hurt, lose members and so on.
As for being or not being used in the character customization, well that is the player's choice.