Nobody's suggesting getting rid of roads for cars entirely. Munich is radically more bike friendly than any big US city, but they still have trucks and stuff. Even in the city center portion that's off limits to regular cars, businesses can get deliveries.

And you can do some deliveries with bikes, I do see people doing it for DHL here on electric cargo bikes for that last mile. Doesn't work for everything of course, but I don't think the goal is literally zero cars ever, it's reducing the unnecessary usage.