“Knowledge and defense” Yoda was certainly a pacifist in his older, wiser years after he was decapitating clones. Though old, wise Ben sliced off a drunk jerk’s arm on his first outing with young Luke. Your point is well taken; Yoda’s words being spoken by Luke would have been a great final lesson for Rey, lay down your weapons and nothing can hurt you when you are one with the Force. Ultimately that’s what Luke did in his final battle: he fought with no actual weapon but with his words.