How is it not?
From the wiki http://sims.wikia.com/wiki/World
Sure, there's some rabbit holes, but other than that your world - your town - is fully accessible to you with every house, building, landmark, etc., being accessible without any loading screens. Maybe they're not the biggest worlds, but how in the hell do you argue they're not open?The Sims 3 introduced the concept of an expanded "open world."
Heck, it's so obviously an open world that people went really angry when the game went back to not being an open world in 4 and coming back to loading screens.
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