This is partly true. But you might still want to avoid g-forces, not because of who or what controls your airborne unit but rather because maneuvering sheds kinetic energy, which is undesirable in combat and you might want to perform drastic maneuvers sparingly purely for kinematic reasons.

No, the biggest limitation on a fighter plane is the fuel fraction. Even new UCAVs won't be designed to handle G forces higher than current manned fighters because it isn't very useful and requires bad design compromises in other areas.

Exactly, the human body actually became the limitation. And all these remind me of Ace Combat 7 (https://en.wikipedia.org/wiki/Ace_Combat_7:_Skies_Unknown)

might as well just launch missiles at that point.