Vehicle Sound Contacts.
While i do believe they belong in the game and have a useful purpose, I feel they give up far to much information on the make up of the Vehicle and the direction they are going.They need to be more random and much less revealing about direction.
Sound Contacts in General.
When battle is going on around you , which i can only imagine to be extremley loud , how much could you really hear? or have the focus to recognize that sound or the direction of that sound.Sound plays tricks on me in my own house,lol. So sound is relative to how quiet you are being , just a platoon in a standard moving motion would create alot of residual sound around them to not hear much , let alone next to tanks or in the tank itself you would not be able to hear anything.
I know this is all very complicated with engine and coding.