You make great points, and maybe I don’t quite have a precise handle on my irritation with his saying that. My thought now is of the other party in nearly all of his economic transactions as a human. Sure he knows businesses/vendors and the like who accept bitcoin and try to contribute to the bitcoin circular economy, but largely, the world doesn’t exchange with him via his assets, it exchanges with him via dollars. It’s the dollars he lives on because it’s the dollars that the vast majority of other parties want in exchange for whatever good or service they provide him. Without dollars Jack is in rough shape. I guess I get very practical when I think about living on something. To live I need my next meal. If I want that next meal I need dollars to pay the store or the restaurant. I’m not going to the grocery store with an ounce of gold and demanding $2k worth of groceries. I don’t live on gold and I can’t in the modern world-at least not without great difficulty-. I live on dollars. Whatever personal economic activity or yield on a particular asset that provided the dollars that I “own” is almost irrelevant when it comes to my getting along in the world and satisfying whatever needs I have. Maybe I’m overly focused on the medium of exchange aspect of the expression, “living on” or “living off” any particular thing. I understand what you’re saying, but for me in the most practical sense, he’s living on dollars because it’s dollars that the other party wants.
Most importantly, and I think this is a good summation of where my head is at, but it’s only when the world wants his bitcoin in exchange for all of those goods and services it provides him, only then, imo, should he say that he’s living off or on Bitcoin. When he goes to the grocery store or restaurant and the only option they give him is to pay in bitcoin, then he should rightly say that he’s living on bitcoin.