Like what general investors in BTC have decided, its not meant to be used to buy groceries. Its a store of value
Because bitcoin value rises from time to time and it is pretty convinient. With just saving it you can also gain more when the value rises. And with that I choose bitcoin more than any currency.
Yes bitcoins can be considered as currency or digital asset, bitcoins can protect the value from inflation because amount of bitcoins is limited 21.000.000 BTC only, the other beneficial on bitcoins we can use small amount of capital to make investment in bitcoins, it is more easy and simple to be used than invest in another instrument of investment.