At that level it's not wealth, in the sense that we think about wealth: it's relative power. The power to make something happen. Like "Long range electric cars

At that level it's not wealth, in the sense that we think about wealth: it's relative power. The power to make something happen. Like "Long range electric cars should be a thing, now" or "Reusable rockets should be a thing, now." Even and especially when most other people think it's impossible and disagree with you. Or you can just build a gold-plated swimming pool and ensure your descendants never have to work. Is that productive? Eh. Versus what? It certainly allows for more risk-taking than government, minimum-cost bidding projects would target. DARPA et al. aside. It's certainly not fair. But from a fairness of opportunity perspective, there are certainly more egregiously-born examples who have objectively produced less to show for it than Musk. Or than Ted Turner, to use another random positive example. (E.g. Barbara Hutton for a negative example)