It's been really hard for the Sims 4 to keep my attention for long periods of time because it's not an open world. That is the sole issue with the game for me. I just hate the loading screens and ...
I could write an essay on this topic, but its late here, so am not going to at the moment :)
In summary - give me set piece and/or hand crafted 'levels' over open world anytime.
Tho not normally thought of open world, games like Crusader Kings are what is proper open world to me - a proper persistent changing world that responds to what I as a player does.
Now if Paradox and Maxis got together and made video game babies together - I'm in.