That's prolly an edge fiat gas over crypto, but there are other advantages a cryptocurrency like Bitcoin has over fiat, it's a hedge against fiat devaluation, it gives it's users freedom and control of their funds, thus making them be their own banks etc, why I'm highlighting this is that the network can't be totally impeccable, just as it has its own problems, so does fiat, and just as people have reasons to pick Fiat over Bitcoin, so so many other people have numerous reasons to select Bitcoin over fiat. Mind you that a coin like Bitcoin hasn't been around for so long for you to expect it's volatility to just disappear, the network is definitely heading for mass adoption, and I think until then, spontaneous volatility will be a part of the network, and tbh, it's not so much of a problem as people make it seem.