That makes it sound like it is balanced-ish. I am sure there are edge cases where org wall would be overboard, human waves and massed infantry tactics was not unheard of in context of WW2, wasn't it?It is very punishing for defenders. W/O CAS the attacker takes almost no damage, so the viability is contingent on air superiority + CAS. CAS on the defender side allows consistent and strong damage ignoring armor. When attacker is applying -50% to defender with its own air superiority and disrupting CAS, sustained attacks can inflict > 1 million casualties in less than a year if the front is long enough. Even if manpower holds, few nations have the industry to sustain that.