Agreed. The scene where Black Widow found the frozen Winter Soldier in storage was a nice, poignant one, and there's earthly reason to add to that.
Show how they first met, and started up their affair, but don't add to it, please.
In fact, that storyline between the two of them comes somewhere close to the fantastic Bucky/Namor reunion scene in Winter Kills. That's one of my favourite scenes in any comic.