At the moment, you have to convert your cryptocurrency to fiat money, but this is not a problem. I think that a couple of years will pass and for converting to fiat it will not be necessary to carry out any unnecessary actions at all. And after another ten years, we will forget about what cash is in general.
For now, I prefer to convert my crypto to fiat money because that is the only way that I can do to buy something here. If the cryptocurrency becomes legal in my country, and I can see many local stores that accept cryptocurrency, maybe I will try to buy my daily needs with crypto. But I don't want to use bitcoin because bitcoin for me is too worth, and I want to save and hold it for a long time. I prefer to use the altcoin to pay something than to use bitcoin because bitcoin is like an investment for me, and I am sure that in the future, the bitcoin price will be increased so high.