That's how I started out and it gave me peace of mind at the time. I just wrote that fiat off and didnt worry about it. Now I'm almost entirely in Bitcoin with card limits that amount to my old emergency fund. Emergencies never seemed to happen such that I couldn't just bill pay my credit card from my stack if I really needed to. Personal preference. And to be fair, I can handle volatility a lot more than back then. Cost basis is what eventually made me move away from fiat emergency cash. It would take a collosal crash for me to be worse off than I would have been sticking with the old way. Everyone has different needs.