Re: Winter Soldier: Bionic arm or not?
Bionic all the way. In fact, I dont see a reason why not to have the arm. Marvel Studios have shown that they are more than willing to have some of the more fantastical elements from the source material translated to screen when other people working for other studios (Nolan, I'm looking at you) dismiss them.
Don't be ashamed of the source material when making your adaption. EMBRACE it.