So that there is no way to promote it on a large scale, and only a small number of people can be reached forever.
In order to make a living and prosper, many families have turned many skills into family skills and monopolized them.
Outsiders can't learn even if they have the heart!
In the meantime, once something goes wrong, it's really broken.
It's not that each generation is worse than the next.
Today, most ancient things can be restored by technical means, not because they can't be restored, but because we can't reach them!
What we can't recover is the ancient craftsmanship!
You are like the sword of the Qin dynasty, which is plated with chromium.
It's easy for us to make a Jian Qin today, and it's not a problem to plate chromium or anything.
But we don't know how the Qin people knew about chromium, how to purify it and how to plate it! This is something we don't know.
The difficulty lies in the craft, not the goods!
In fact, you can do anything! And the products produced today are much better in quality than in the past because of standardization!
It's just that the ancients inherited the traditional concept that men don't pass on women, and we don't know the skill!
We have done everything they can do today, and the quality is only high or not!
But we don't know how they did it!