Back in the Sims 2 days, people would upload stories to the Exchange, and they never focused on just one expansion pack. Rather, the number of expansion packs was irrelevant to the story, and when I say "story", a lot of them were either observational stories (in which the author took a lot of pictures and wrote comments about them from the author's POV) or dramas (in which the author had a fixed plotline and scripted behaviors/texts). But, people never really focused on one expansion pack.
Now, moving to the Sims 3, I see tons and tons of YouTubers who may post "Sims 3 Generation Let's Play" or "Sims 3 Seasons Let's Play". As the viewer, I would assume that they focus on just one expansion pack by keeping only one expansion pack installed, but nope, they actually have a wide variety of expansion packs, maybe even stuff packs, Store content/worlds, custom content/mods. What's the point with this?
The same thing occurs with The Sims 4.
Perhaps, The Sims 2 expansion packs were so well integrated with the base game, because the base game had the basic coding for the expansion packs in the original release, while The Sims 3 expansion packs and The Sims 4 expansion packs were their own little thing and deserved special attention because they weren't very integrated into the core gameplay?