As someone who loves supernatural play I actually agree with OPs perspective. The base game is supposed to be the foundation. Packs expand on that foundation and are where we get the fun stuff. EPs shouldn't be used to give us basic things that should be in a life sim game by default.
For example, laundry should be in the base game of any sims game. Laundry is something we all begrudgingly have to do irl and if it was already included in Sims 4 we wouldn't have had to waste a pack on it. Seasons should be in the base game for obvious reasons but instead we had to wait like 4 years for our sims to be able to have anything besides sun (I know that many places in the world pretty much only have sunny weather and that Seasons being an expansion pack is an easy cash grab but still). We shouldn't have had to wait for University for our sims to be able to shower woohoo. As if they couldn't just put that in the base game. Showers and woohoo are both in the base game after all.
Beefing up the base games would, in theory, make the expansion packs more creative and focused
