As you point out, it is all game theory.
But things that arrange for the game to be more beneficial to everyone, that align our interests more, deserve to be called "good", regardless of their inability to universally do so.
The latter would be an impossible bar for anything.
Where I find things frustrating, is when someone thinks because something is "good", it somehow becomes "enough". (Think, capitalized versions of different economic schools of thought.)
Game theory is just math. As with any math, the calculations can all work out, but that says nothing of how it reflects nature. All you can say is that if the axioms are all true, then this is the necessary outcome. Look for string theory as a cautionary tale here.
Game theory assumes rational systems. But we have over 6 decades of behavior science which contradicts that fundamental assumption. Economic behavior is not necessarily rational, and subsequently it is not inherently game theoretic. You will find plenty of dogmatic, idealistic, superstitious, counter productive, etc. behaviors in an economy. You need psychology, and not just math, to describe the economics which happens in the real world.
> Hard to call such actors rational, but that does not stop as from studying them.
This is precisely why I object to your first post. “Shut up and do the math” has not done the wonders which string theorists had hoped. Game theory is a perfectly fine way to mathematics, and to study certain strategies, but it tells us nothing about the nature of economies in the real world.