When you're in traffic and have cars behind "pushing" you to go faster, or to "close up the gap" between you and the vehicle ahead of you --- and that vehicle happens to be another motorcyclist....
I always go to a staggered position, even if I don't know the other rider. It's safer FOR ME if they "eat *hit", swerve, whatever.
Out on an empty country road, don't know the other rider, I'm gonna stay dominant (directly behind them on the left side of hte lane) but FURTHER behind him/her UNLESS I'm overtaking or planning to overtake.
That way if I see them brake, swerve, or suspension travel (pothole, bump, debris, unseen speed bump, etc.) I get info that allows ME to brake, swerve, ...
Safety for myself and the other rider are my ONLY concerns, although showing courtesy to cagers always helps, never hurts.