To me, it wasn’t so much about each DLC making a huge impact or the story being amazing. It was more about already playing the game to death and then gaining access to more content to explore. Kind of like eating a delicious cake, still being hungry, and then finding another slice of that cake that was sitting out all day.
Also it shows a lack of empathy. 9/10 times it’s not that the client is dumb, but that they’re unfamiliar with processes, recieved conflicting information, have other requirements you don’t know about, have personal things going on, or an endless host of other factors.
It could even be that you didn’t do your job properly in explaining or walking them through. Like if I was a customer and the client-facing representative was so fragile that he’d blow up in my face over a minor inconvenience, I probably wouldn’t feel comfortable asking for something explained a second time.