Once you know where all the enemy tanks are located, they can simply be avoided, or used as a map of the enemy troops, or targeted by every available weapons system. With precision munitions, sitting in a tank whose position is known means that your lifetime is the period of time until the opponent decides to destroy your tank.
All that armor doesn't do much good against a direct hit from artillery, a 500 lb bomb, or a Hellfire missile. Or even another tank or a helicopter whose fire control system has your coordinates in its target list.
Neither do BDUs.