Well it is simply that cash really works offline and it is the traditional way. This is the way of trading where we became dependent to it. Having a cash in real life is the traditional way of living, means that every people used that especially our elders. But bitcoin is the new money or new currency. But I think we need to cope in the future. And this is the future, this is bitcoin. The next generation of currency.
Yeah digital currencies such as bitcoin suitable for next generation where the world today is still not too sophisticated. Many people prefer cash because they have not understood how easy it is, and more simple to use digital currency. So for now cash is more often used