Im not sure if real armor addon works, it seems to me that tanks dont have spots where they are invulnerable, and they still keep taking gradual damage along with the crew.

For example, hitting the slammer on the turret cheeks will wear down and blow up the tank after repeated shots.Same for the upper glacis.

Another example is shooting the NOT NAMER apc with autocannon frontally. Takes a lot of AP rounds from an autocannon, but eventually it will blow up.