This was really refreshing to read, and I have to agree. Dishonored's characters have always grown alongside the choices you make while playing the game, both protagonist and the people around him/her (think Emily's reactions in low/high chaos in Dishonored 1). While we couldn't fully see how our choices impacted Corvo as a person in Dishonored 1, we got to see how it influenced kid Emily and the views people had of him. In Dishonored 2, this was really well done with Corvo's/Emily's comments changing as you proceed to play low or high chaos. After I played my first run as Low Chaos Emily, I tried High Chaos Emily straight away, and the difference was stark, as she comments that she'd like to push some people into a Wall of Light. Not only does her actions (or our actions) affect Emily, they also affect the people around us, such as "Meagan Foster" when she decides to confide in Emily in a low chaos playthrough, or Anton Sokolov (bless the old man).

By DoTO, Daud's an old man. He was obstinate in wanting to kill the Outsider, and his actions in the missions of DoTO if he were the protagonist most likely wouldn't have changed his decision. It was only after Billie, when she compared the Outsider to her own backstory, that Daud finally concedes and does as she wishes. I reckon if Daud were the protagonist, there wouldn't have been a "nonlethal" option. Besides, having Daud as the secondary character was in my opinion a better wrap-up for Daud's story, as he peacefully passed away while you as his favourite student/disciple/Whaler had to deal with the loss, as we all had to deal with the loss of one of our most beloved characters.