The nature of warfare has totally changed, aerial and submersable drones costing a couple of thousand can take out stuff that costs millions. They can also overwhelm missile defence systems like Israels Iron Dome with all it's Patriot batteries, you just swarm it with hundreds of cheap drones and make them fire off hundreds of expensive missiles, eventually they will run out of missiles and will face logistical and financial issues when it comes to trying to replace them. Meanwhile the attacker is free to start using their missiles once the drones have done their job.