After the emergence of aircraft carrier during WW2, battleship no longer held position as the flagship in the battle group.

^ The naval gun on the warship able to supply longer sustainable firepower, compare to those missile.

Although those big naval gun (430mm on Japan Yamato Battleship during WW2), no longer been used now, the small calibre naval gun still had its role on modern navy.

Secondary explosion after the ammunition storage section get hit, common design flaw on those old Soviet Tanks.

Does this also apply to our PT-91M? IINM, it was a modernized version of T-72 by Polish Tank Manufacturer.

Reactive armor plates, When some shell/rocket (especially RPG) hit that "brick", the brick will be triggered to self explosion, use this explosion force to deflect the incoming projectile. After one use, the tank area that covered with the reactive armor plates will no longer be protected by reactive armor (since the brick had exploded)

Nowadays, some RPG warheads had tandem warheads to pre-trigger the reactive armor to explode early, making it less effective at countering RPG.

Not all, some western tank still use manual reload. So most of their tank crew consist of 4 people (captain, driver, gunner, loader)

Most of the auto-reloaded tank are those russian tanks, or France's AMX Le'clerc tank.