Saving more than spending has also been popular advice for fiat, at times. More for medium/long-term personal purposes at the expense of immediate macro purposes, but I think that applies to both systems.
Cryptobros thought that they are smarter than central banks and didn't bother to implement proper monetary policy in the Bitcoin protocol to prevent its volatility.
Real interest rates are typically positive, so no, you are not.
Want to elaborate? Bitcoins monetary policy is beautiful in its simplicity and predictability. In that sense, it stands in stark contrast to fiat.