I was loose with currency. I meant it was backed by gold forever. Until what 40 years ago. And again we’ve just ascribed value to gold. It’s not really of any independent valueHow often are gold and silver used as currency? They used to be regularly, of course. But it's been a long time.
CC is sometimes used as currency now. But it's still exceedingly rare in a relative sense. And I would guess that Gresham's Law would explain at least part of that: if you hold two currencies, you're going to spend the one you think will have less buying power in the future...and hang on to the one you think will have more.
But is that the only reason it hasn't yet found much purchase as a medium of exchange? I'd argue that there are other things holding it back. Look at exchange rates when you use crypto to purchase something. They're almost unfailingly unfavorable to the buyer, relative to spot prices. It's even worse when you're converting USD (or any other fiat currency) into crypto. I would expect these to improve and standardize at some point. But they haven't done so yet, in my experience.
Also, they're highly volatile relative to major fiat currencies -- which necessitates the hedges that mediators and merchants have to build in. They're going to protect themselves, and I can't blame them. And that comes at the expense of the consumer.
If we'd have asked most crypto guys 7 or 8 years if crypto would be at least somewhat commonly used as a currency by 2025, I bet that most of them would've said yes. It is more commonly used today than then. But nobody would call it common, not for ordinary commerce anyway.
And I'm still skeptical it ever will be.
The remainder of your take on crypto I think can summarily (no offense) be dismissed by its relative infancy.
What I’ve never understood about crypto is this notion that it operates adjacent to or independently- why couldn’t gov just co-opt it regulate it eliminate its appeal in that regard and basically make it defacto fiat currency