@_lovcat_ I'm not a tech guy so I'll give a relatively un-techy answer - I wouldn't be a good person to comment on the differences in the engine. One of the really big changes with Sims 4 and something that was an early directive for the game was to put powerful tools in designer's hands so that they could focus on adding content and increasing the depth of the content in the game without needing an engineer to implement or iterate on new functionality and new interactions every time we wanted something. The tool they use - internally it's called Object Editor - allows them to select from thousands of variables to piece together all of the available assets and churn out content. For example - it's a big part of why this is easily the most in-depth socialization system in a Sims game to date.

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