Actually, the original plan with the radar was that it's going to be a server side option (like it is in 2.75), which means it's up to the server admin to allow it or not. Of course if it's allowed, and you don't use it, you're dumb, and at a disadvantage.
There's been a pretty good concensus among the forum member that the radar should be removed, as it is neither realistic, nor does it add to the game (most think it actually detracts from gameplay: myself included).
We'll have to see though with 2.85.
-Infiltration HQ, Graphic Artist
"For you, the end is near.""