Originally Posted by Spider-Fan
No, it is because it is better from a writing standpoint. Her being dead is sad, yes. But, you don't see the contrast that an elderly Peggy does. When you see Peggy old and gray, you SEE her journey to where she is now in contrast to Steve's. You also see a human reaction to her finding out the man she loved, who she thought dead, is alive. And he doesn't look any different. It's far more sad and emotional if she is still alive.
That's exactly why I'd love to see a scene like that in CA2. Very well said S-F.