I would love to have drivable and interactive cars, but it's not a must have. I support those who really want them though.
The reason I don't feel they're a must have is the way the worlds are constructed. The worlds and their individual neighborhoods feel tiny and close together. I have to imagine them being big. In comparison TS3's worlds were much larger, they felt big without the need to imagine them being big, and cars or mass transit felt like a necessity. Time passed when you traveled across, say Bridgeport, and you needed a car or mass transit to get anywhere quickly. That's how I remember it. I haven't been able to play TS3 since 2020 when I bought this computer so my recollections may be off.