There's a big difference between money that returns 10% within a given time period and money that remains even, or has mild ups and downs in value. If money be

There's a big difference between money that returns 10% within a given time period and money that remains even, or has mild ups and downs in value. If money becomes noticeably less valuable over time it becomes less attractive to hold money at all - and instead scarce assets like a house, land, or gold, etc would be far more desirable. Suddenly everyone is happy to lend you money but no one wants to hold it. Prices soar. It's true that BTC would be hard to keep as a currency because there is a tendency toward hoarding when something is rising in value. That doesn't prove inflation is desirable though.