ARMs generally require a supporting electronic warfare suite to be effectively employed. EW equipment draws a lot of electrical power, so you need a large aircraft with large engines. This is against current drone trends, though it is likely such drones will eventually be deployed.
Another challenge is that ARMs are designed to fight air defense systems that could potentially include equipment to jam drones. Concepts for future drones include a "drone commander" manned aircraft nearby (as opposed to an easier to jam remote operator) and onboard AI to make autonomous combat decisions.
Overall the drone likely won't be much cheaper than an F-35. But it can be sent on suicidal missions without risking a human crew.
Another challenge is that ARMs are designed to fight air defense systems that could potentially include equipment to jam drones. Concepts for future drones include a "drone commander" manned aircraft nearby (as opposed to an easier to jam remote operator) and onboard AI to make autonomous combat decisions.
Overall the drone likely won't be much cheaper than an F-35. But it can be sent on suicidal missions without risking a human crew.