As the editions go,the fighter class has been more and more focused on martial skill. And other warrior classes have brokenoff to focus more on what powers their combat ability. Paladins became more divinely powered. Rangers became more observant. Monks gain a better handle on the power of ki.
But the Barbarian, when it broke off, snagged 2 bits: Emotion and Physical Ability. Rage and Raw Strength.
We could split the Barbarian in 2.