&gt; <i>The game set a new, extremely high standard for the genre. Each denizen has a family, a career and travels around the city as an autonomous entity fulfilling his day to day errands. The consequences, especially on traffic, is a fascinating thing to comprehend.</i><p>I&#x27;m surprised it wasn&#x27;t done like this before - it&#x27;s kind of the most obvious and &quot;right&quot; approach to model it. Why is that? Computational reasons?