Your exception is the answer.
Only the central regulator can "mint" money and doing so has real world consequences. The central regulator has financial incentives to limit this sort of activity.
The bizarro world of crypto has no such regulation and as a result, it is inherently unstable.
The proof of this is right in front of you --- it is the fact that "stable coins" exist. The only way to bring stability to the bizarro world of crypto is by tying it to "fiat" --- which is the very thing crypto is supposedly working to eliminate.
Contradict and hypocrite much?