Yes, they also sent in 100-200 drones at first, as well as the older missiles.
The drones and older missiles get shot down, then they can locate where the Iron Dome and David's Sling batteries are. (They're mobile, literally just hitch them on a truck).
After they're located, they send in the better rockets to target them.
Which is why it's especially fucked how they're not protecting Palestinian (~~arab-israeli~~) neighborhoods with the batteries and are instead prioritizing the jewish neighborhoods.