Why take completely unhistorical approch to vehicles?

[KnightFandragon]

Ive always wondered what are the effects of a tank shell once they penetrate armor? Not modern day ones but WWII shells like the 75mm of the Sherman. It is so low velocity that it couldnt penetrate the front of anything but can penetrate the side, what does it do to "knockout" the tank. Ive always imagined a Sherman round penetrating the side of a panther tank and since the shell is Low Velocity it goes through the armor but loses all velocity and is left resting on the floor of the Panther.....while the Crew is just laughing and killing the Sherrmy. Anywho, Does the explosion of the shell light up ammo or something? To me it seems an AP round going into a tank just makes a hole, its like why get out? The tank still works.....If it doesnt light up or explode why bail out of it? Ive always wondered why crews bail from a mostly perfectly fine tank.