The reason is extremely simple : HE cannon overused. Let's take a quick look at the weapons. HE Cannon : Anti-infantry/vehicle/building. 12 seconds damage : 490 12 seconds heat gen : 84 Ranged Cannon : Anti-vehicle/building. +10 weight than HE. 12 seconds damage : 540 12 seconds heat gen : 72 Rail Gun : Anti-vehicle/building. +20 weight than HE. 12 seconds damage : 650, 12 seconds heat gen : 91 I really don't have to explain this, you have absolutely zero excuse when you researched ONLY HE and you lost the game to "OP" NF heavy tanks. NF heavy tanks(Guided/Shotgun) are single-point DPS machine(with small explosion radius) specifically designed for vehicle combat, I don't know why people HAD TO use HE cannon against them. I am not saying you should abandon HE, but at least get ranged/rail at some point, you might magically realize that tanks are not THAT imbalanced.