They are useful in that they help guide us to achieve what we want to achieve and they are powerful. I agree with that.
Yes it is all subjective in the end. Personally, I believe even God's desires are largely subjective. He created people because he wants to be loved. That sounds subjective to me. So yeah, I think the concept is all-encompassing.
Anyway. I don't think these things can be made measurable unless we build a computer in which to perfectly simulate society and try different things and see what works. But even then, the desirability of various outcomes would still be subjective.
The beauty and horror of it is that the system can be anything we imagine as long as we expend the energy and resources to build it. I did not seek to create a system, people will do that on their own because instinct and comfort compels them to and a lot of times they end up pretty unique solutions with (from my perspective) good and bad things about each and everyone one of them, including ours.
Anyway. I think we are going to have to end it. I need to do chores around town for the sake of my kids. See ya.