I think we should always get 2 choices, even if those choices ultimately don't affect the outcome. Like already mentioned, killing Asahi would have been an act of war. So having him die at our hands, is a no no. But the game should at least try to create the illusion of choice. Choice 1 would be the default cutscene. Asahi is a ****bag, but we can't do nothing but watch. Yotsuyu is the one that kills him in the end. Choice 2, would us be like "To hell with everything, he dies." We strike him down, standing above him, about to deliver the killing blow. But we hesitate, and Yotsuyu kills him in that moment.
The outcome is the same, Yotsuyu kills Asashi, but at least it allows us to try and act like we think we would. Just give us 2 variations, like when Papalymo sacrificed himself. We can turn around and run to the ship, or decide to stay by his side, but then he'll blast us unto the ship. The outcome doesn't change, but at least we can decide how we react in the situation.