In a universe as extensive as Marvels, its important that each character has a distinctive look to them.
Characters usually wear an updated iteration of their costume in each new project.
He originally received his prosthetic under tragic circumstances.
After falling from the train inCaptain America: The First Avenger, HYDRA found him missing his left arm.
While fighting Steve,hes even able to block hits from the Captain America shield.
The studio likely uses the practical arm as a base and thenuses CGI for the plate movements on top.
Upcoming MCU Movies
