I'm unsure why "realistic" mode means one shot and you die (Call of Duty, Black Ops 3)

Is it just simulating the fact that a gunshot to the leg would mean you get shipped back home and get turned into "That marine character that acts like an asshole because he got injured like an idiot"

I mean, it's not like you get your f**king arms ripped the f**K off by a f**king insane robot fuelled by testosterone and...I don't understand why it didn't just step on your skull terminator style.

Anyways turns out in the future becoming an amputee in the military is actually a good thing, robot arms are much cooler than normal arms don't you know?