For me, it is a currency/technology that did not promise the world, but is gradually dominating it. Countries with great economic power are already making their reserves, much progress has been made so far and many others will be achieved. Unlike many currencies that promised a lot and delivered nothing.
You are right, so many coins did made promises a lot but achieved none of it so far. Many coins are a big disappointemt, where people had hopes in such coins but no progress was done.