Tanks don't really make any sense. MBTs are designed to fight other MBTs. Out of the thousands of tanks that have been taken out in Ukraine, 99.999% has been by drones, artillary or ATMs. You can count the tank versus tank battles on the fingers of your hand. Wouldn't make more sense to evenly distribute the weight of the armour, so the back and top are reasonably armoured, rather than have foot thick armour in the front to stop rounds from other MBTs - a scenario which literally never happens.