But I want my nazi spitfires!
Seriously, imagine (if playing without icons, which is the way it should be) your wingman suddenly engaging you, while talking on the radio that he's on the enemy's six but lost sight of you. Could happen during an engagement with real enemies. Talk about realistic simulation!
And you're like "That's me you're firing at! You fool! Stop!", and he's like "No no, it's a 109". Then you go "Check your oxygen right now!".