I’ve felt this way for a long time. For me personally it’s because the base game is flawed. Sims are boring, they are all replicas of each other with different faces and hair styles and traits are basically moodlets. The creator of the Sims Franchise Will Wright recognised that players spent more time exploring failure states; the sims 4 fights you every step of the way should you try anything negative. And I don’t mean killing sims. I mean anything that could be considered negative. Try and have two siblings not get on and the second the player doesn’t initiate any teasing interactions, the game reverts back to them hugging and joking. There is also a severe lack of consequence in game which makes things boring.
The way I see it is is the above issues I’ve saw many people complain about, a game changer even made a video where she mentioned the above. But it won’t change as I don’t believe EA consider it broken. The problem is that no matter how much dlc you throw at the game, it will always be dull as long as those core issues exist. The dlc isn’t even attempting any more to improve our sims or make them more dynamic. It’s set dressing.