It is desirable for a reserve asset and a store of value - which are use-cases for a currency. It is obviously not great to have a deflationary currency as the only option for spending. However, luckily we still have fiat currencies which are ideal for spending as well as Bitcoin which is the superior savings vehicle.
Bitcoin has only been around for ~11 years and by all accounts it is still in price discovery mode. Eventually it’s value will stabilize and it may serve as a better unit of account.
Until then, spend your fiat and Hodl your bitcoin.