Why, after more than four years, do sims still lack distinctive personalities? (and other issues)

I agree with everything, it's been stated a hundred times here. But game is almost five years old, I think they have no interest in any of this or we would have seen it by now. It's not like before where we could expect several new aspirations, traits, new skills, new talents etc. with each new pack. I fear this is never going to be improved and frankly I'm tired of asking.