We don't know what purpose drone fighter would be capable of. There are physical limits beyond limits of the pilot. One indication that nobody is investigating

We don't know what purpose drone fighter would be capable of. There are physical limits beyond limits of the pilot. One indication that nobody is investigating high-maneuverability drones is that the demonstrators are mostly stealthy flying wings. Flying wings are less maneuverable and planes need stabilizers for that. It is the difference between B-2 and F-22. I think we will see drones in more in support roles; Navy made an aerial refueling drone. Also, the tactics for air-to-air combat have changed. It doesn't matter if can maneuver more if can't outrun a missile. Russia still emphasizes dogfighting but the US is all about missiles and energy management.