Sure, if the game is designed that way, it’s certainly then the “job” of the GM to run the game accordingly.
My point was about why someone would enjoy that. It’s not a necessity for doing the job of GM in general. It’s about enjoying the play experience that is created by handling things that way.
You realize there is a load of space between "necessary" and "about enjoying" that you are excluding?
Like, I don't absolutely need a 12" cast iron skillet in my kitchen. I didn't have one for decades, and got on just fine. And it isn't like the cast iron is particularly fun. Indeed, it is awkwardly heavy, and cleaning it is more work than cleaning my non-stick skillet. Using the cast iron is more work, generally speaking. But it does support some bits of cookery better than a non-stick skillet. So I have it and use it when called for.
Meta-currencies are tools. You use them for the same reason you might use any other tool - it assists you in getting something done.






