There's no roads for cars
There are no roads leading to many of the lots in Sulani, some in Komerebi, Batuu, and the vacation worlds. I feel like this is an intentional design to hint that cars would be decorative at best.
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That's always been my thought train on the whole "We want cars!" crowd. Maybe Willow Creek it'd be fine but half the other worlds aren't designed for cars. If the game was designed from the ground up with cars in mind then they'd be a totally viable thing but there's way too many worlds where there's no roads, or the roads that are there are far away from the lots and it would take ages to walk to them, which would make it take forever for sims to get anywhere in snow/blizzard weather conditions, and would be terrible for vampires whenever it's sunny.
