The radar in-game is there to kinda-sorta substitute for the combination of ground radar and ground controlled interception which was used during the war. A moving map with integrated datalinked radar contacts like we have obviously wasn't available then. Realistically you'd just get a ground controller telling you "large formation heading north, vector 090, 30 miles, angels 10". That'd be cool, but also chaotic given the fairly random nature of the MA, where formed groups are rare and formations non-existent. You'd be getting all this information in your ear that would be unhelpful 90% of the time.
Same same, it'd be great to have no icons - I hate icons. But since we don't fly in formations, how can you tell friend from foe? And how can you tell which friendly you're talking to? In reality misidentification and fratricide was a big problem, but no-one wants that in the game.
Now what would be cool, for scenarios at least, would be a couple of buttons, one of which would give you the verbal vector to the closest friendly, and another to vector you to the closest enemy (if they were in range of a radar, of course.) Then dot/bar radar could be turned off, and you'd get a more historical experience.