Wow, they made up for Wyll's lack of content in the rest of the game by giving him lots to say at the end (at least as a duke)! I love it. Gonna go start another Wyll-mance run.
Free from Mizora Blade of Avernus without Karlach also has a lot to say. If you have both him and Karlach they elaborate on each other's narrations. I wonder if the writers tried to keep a common narrative logic in mind for the stories. For example, I noticed that when Friend-Astarion tells you about his life, he comments how the shift to nocturnal life was hard for him at first. When I choose the adventuring lifestyle for Origin-Astarion with romanced Gale, Gale also comments how it took some time to get settled into their new life together but that it was worth it in the end.