>>63985808 (OP)>Because designers didn't care about how their designs would behave after being penetrated.they did, and even the soviets tried to make it so that they wouldnt explode so violently when hit
prior to modern blow-out racks, tanks tried to avoid catastrophic detonation by placing the ammunition on the floor of the tank to make it less likely to be hit when penetrated compared to the walls of the hull
the soviets did use floor ammo storage for most of their tanks, but the very small size of their tanks meant that a large portion of their ammo had to be in the sides of the tank where they would be hit easily
obviously, floor storage is not as good as turret bustle storage, but that does not mean that the people using floor storage did not care about safety nor did they totally ignore post-pen effects