25 years anniversary, 11 years old game and 100 packs ... It would be a good time to refresh the core.
I know EA has started to refresh SWTOR after its 10th anniversary so it would make sense if they do the same thing, we saw it recently with DirectX optimization.
But at the time EA has also ambitious plans for The Sims franchise, shopping cart button, events and main menu have been added inspired by Fortnite and Mobile games. I don't think fixing the bugs will be the only reason for a break.
AI features to improve the search engine are also planned, inZOI is already working on ACE (Nvidia AI) to make smarter NPC so EA must show something to the shareholders.
I think all these things are exciting, I'm impatient to see what The Sims 4 will become.