For instance, when barter and basic trade was used, people had to figure out new methods to do accounting and record-keeping: whether through sticks, tablets, papyrus, etc. It seems simple now, but these basic methods were incredibly huge technological leaps that took a long time, perhaps centuries in some cases, to develop.
When silver/gold were beginning to be used, different lessons had to be learned such as making the edges of coin ridged to prevent certain people from clipping chunks off of coins and taking a small piece of precious metal.
With fiat currencies that are not backed by anything, people had to learn the lessons of inflation. I'd argue that not all humans have even learned this lesson even today. While inflation is particularly glaring today, all people alive today have been systematically robbed of their savings every day, yet this fact is commonly ignored. The amount of value lost by people to inflation is much more glaring than any loss that's happened in the crypto space. In comparison, crypto doesn't have this flaw: there can be no circumstance that changes the fact that Bitcoin only ever has 21 million units and cannot ever be inflated.
Crypto has much smaller problems in comparison to other forms of money. It certainly needs better user interfaces and best practices and a little time for social acclimatization, but the progress from what was a proof of concept in just 13 years has been remarkable.