Well I'm looking in this way..... In cities, when they had to traverse through streets I guess the tank commander HAD to open it up and check the surroundings, no?
EVEN THOUGH if it is ridiculous, I can't see how an easy kill would it be, since it's a problem enough to climb on the damned thing let alone walking on the tank. You would be shot probably in 95% of the cases. So I was just hinting at why don't we have an alternative way of killing tanks by infantry?
P.S. in BiA you had to kill the commander and after he was dead you could jump on and throw it in.