The thing is... why would any reasonable individual use a currency with inflation when they can use an equivalent currency with deflation? Governments can force inflation on people - cryptocurrencies have no ability to force anyone to use them.
Governments can only force inflation of the currency, not of all assets. That helps to keep value in investments that pay a return and increase real value to society over holding currency which doesn't.
Or you could say why would any reasonable individual use a currency with built-in boom-bust cycles when they can use an equivalent currency with reasonably stable value?