You'll be pleased to know that Professor Randall Wray* agrees with you and goes a bit further beyond your "not much of a currency" all the way to "not a currency at all". That's because all true currencies, including fiat, are liabilities of the issuer. (I.O.U.s in other words).
See Wray's comments here:
The best option for countries experiencing too much inflation would certainly
not be to try and adopt bitcoin as the country's unit of account.
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*Wray, a Minsky protege, is a well known economist. His 1998 monograph entitled "Understanding Modern Money" along with Warren Mosler's 1995 "Soft Currency Economics" are considered seminal works in what is now being referred to as Modern Money Theory.