Drones are immensely helpful in getting across minefields. Being able to attack enemy positions across the field prevents them from being able to safely attack sappers trying to remove the mines.

It is much harder to stop a small drone attacking a mobile position than it is to establish a large AA battery that defends against missiles. Missile AA is for protected largely stationary high strategic value targets. Drone AA has to be for small tactical level targets on the go. Way harder.