YupThe biggest advantage to using drone swarms over conventional weaponry like artillery and missiles are:
drones are small, slow, emit low heat signatures, made mostly of plastic and can be ultra low flying. Trying to detect them at anything like a decent range would be difficult to impossible depending on the conditions on the ground.
Conventional artillery and missiles can be detected much further out, giving the target more response time.
Few nations other than China have much in the way of viable counter drone systems available. Hand held drone jammers are few and far between, and designed to counter commercial drones. How effective they are against military drones with hardened electronic and counter jamming capabilities remains to be seen.
Conventional weapon systems would also have a hard time effectively engaging drones give the above mentioned detection issues and the sheer manoeuvrability of drones.
Accuracy and control of the drones
With a drone swarm, you can specifically pick priority targets to kill almost up to the last second before impact. That means you can make sure that the most important targets are taken out. With a drone swarm, you also have instant kill confirmation up to the last drone in the swarm. That way you can be sure what needs to die is dead, allowing you to immediately move forward with battle plans without needing to waste time doing damage assessments with other assets after the attack.
Flexibility of deployment
These drone swarms are best used in urban areas to pick out enemy military assets hiding in civilian areas. You can accurately pick off large numbers of enemy military assets hiding with minimal risk to nearby civilians that would be impossible to achieve with a conventional missile or artillery barrage.
Consider how drone swarms like this could be used in a Taiwan scenario.
You'd have thousands of drones swarming every nook and cranny.