I would enjoy having cars in the game, since I think not having them does impact the realism-especially as someone from the midwest, a lot of my life involves around driving since nothing is walkable here. It would be another way to spend money (yes, I do think the money system is too easy in the sims 4) on the cars themselves and also maintenance. Cars could allow for new careers like taxi driver or repairing cars. That said, at this point I think it is unlikely that cars will ever be added to the sims 4. A lot of the worlds aren't really optimized for them and they don't fit in as well in the closed-world system. There are other additions such as further improvements to personalities, more outdoor activities, and preteens that I would like more.