of course it is.
investing with bitcoin is very profitable but it will never be advisable to turn all your money into it.
bitcoin's price is still very volatile and no one really knows what could happen the next day.
therefore it will always be better to leave some of your fiat for emergency purposes.
.
although one day i dream of living in a world where cryptocurrency is the main means of transaction.
but as of now we are still far from it yet.