1 car for our family of four seems to work fine for us in the city. Hard to imagine people with different living situations.
I held off a while on giving my youngest child his own iPad because he and his brother were playing nicely together on one more often than not. It turned iPad time into social play-together time.
Wait until your kids are older.
If they are European, they learn to get by with public transport, bikes and such.
I was already on my thirties when I got my first car.
What's the point here? Then you'll need another car?
Remember, we're comparing to iPads. Apple intentionally hobbles them to induce demand for multiple iPads. This isn't a question of being allowed to own multiple iPads/cars. It's a question of being artificially prevented from owning a single one.
The point isn't that you have to commit to being a single-car household for life. It's that at some points in time, you can be.