The thing is, if increased cyberwarfare capabilities allow you to exploit some large percentage of the drone force, then that would leave an extremely large gap

The thing is, if increased cyberwarfare capabilities allow you to exploit some large percentage of the drone force, then that would leave an extremely large gap to exploit by the enemy. If you can't fly drones because you risk them being crashed (or worse, turned on you), then you need some backup force. That might be real pilots, or it might be non-remote-controlled drones, or some combination of things like that.