In China, you can’t exist without a smartphone, because for all existential things you have to do (paying bills, buying tickets etc.) , you are forced to use the almighty wechat app. Smartphones are a tool to manipulate and to spy on the population. It is a tool utilized by the ruling class, to control the masses. I hate the future and I hate “progress”.
We can use new technologies, but we always should have a fallback option, in this case cash, otherwise quite bad things usually happen if the technology fails. Planes also have multiple backup systems, many even systems which can work during total electrical system failure. One would expect similar levels of redundancy in other crucial systems, but somehow this is not really the case.