1. Process lost. For example, after steel products were widely used, many technologies and experiences related to bronze ware manufacturing disappeared with history.
2. No raw materials. For example, some kinds of blue-and-white porcelain can no longer be produced after the cobalt materials used to make some blue-and-white porcelain have been mined or no new mines have been found.
Many high-quality porcelain products in ancient times were guaranteed by high defective rate, but they are gone today.
4. With the emergence of more efficient processes, the original time-consuming and laborious old processes were naturally eliminated and lost. Take the slide rule as an example. Skillful use of slide rule was the basic skill of engineers only a few decades ago. Not to mention skilled use today, there may not be many people who have seen the slide rule in kind.
Many ancient crafts were discovered due to some accidents, and once lost, it is difficult to recover. But sometimes for the purpose of commercial propaganda, the performance and level of some ancient crafts and products are deliberately exaggerated.
6. the lack of talents in this industry is actually a talented person. But that's all. There are talents in society, but these talents will naturally flow to high-income industries such as IT and finance, which can best prove their value. The level of talents flowing to traditional industries is naturally lower than that of decades ago.
In addition, don't miss the past, cherish the present. For example, you may admire a person who can do abacus skillfully, but will you give up your computer or calculator to do abacus?