I agree with regard to the usefulness heavy platform (like tanks). APC(BMP) at the moment, IMHO of course, no measure up to conditions of any conflict. Concerned to both arms - to a lesser extent, and protection - more. Passive armor seems to me, is an important component of survivability vehicle on the battlefield. For example in IDF created heavy armored APC's like Ahzarit, Namer. These APCs can interact with the tanks, as have a comparable level of protection of both the kinetic and the cumulative weapons, various kinds of mines and explosive devices.
In ARMA 3 many simplifications, but it seems to me that for the protection of tanks is not sufficient, and the power of tank shells - understated, assortment of shells - no good, minimum level of fire range of tanks and armored personnel carriers weapons - too short.
I understand that the ARMA - no Steel Beasts Pro, but I hope that the developers will correct it does not match. If - no, we need to wait for modes, like Armor Improvement System (AIS) mod :) :)