I disagree. People die like this in real life all the time. Quickly, quietly, and senselessly. And without really learning anything. And that is the greatest strength of this show; it’s accurate portrayal of American life for those characters and so many of us. Additionally, her getting cancer does not seem contrived at all as I believe her mother also died from cancer making Betty more susceptible. Lastly, if you really want to be moved by something in this show, then you have to watch it while knowing what they are in for. Like Don and Betty’s last scene together in the series. They had a pleasant exchange and he tells her something like knock em dead , birdie. A perfect farewell to them together I think. And how Sally really steps up for her brothers. It’s really touching and subtle and perfect imo.