You can buy almost nothing with crypto at this stage. You will be in deep trouble if you try to survive without touching fiat.
What I'm talking about is crypto valuation in terms of fiat being inflated just like the stock prices because of the very light monetary policies of most large central banks. Cryptos are assets, not money. They're being hoarded and not spent. Those are the facts on the ground now.
Nobody said not to touch Fiat, until adoption and fungibility are widespread, Fiat will have it's use. Cryptos are being hoarded because they are a better store of value, period. Once adoption and fungibility come along they will be used just like Fiat, and they are indeed a currency, the public has yet to see and accept that, those who are hoarding it are aware of that. That is why they are happy to exchange Fiat for crypto.