As scions of a great clan, the Yu Family members paid close attention to the monopolization of knowledge.
Only through monopolizing knowledge could a clan better consolidate its status and gain more development opportunities than others.
In doing such things, it wasn't just members of the Yu Family; taking them as an example, they had many blind spots and even misunderstandings about knowledge because stronger forces had blocked them from accessing relevant information.
The Yu Family didn't mind inviting craftsmen to learn a thing or two, but they could only acquire some practical skills. As for the most basic, theoretical aspects, they didn't even need to think about it.
This was much like the major powers of the Earth Realm selling arms to Africa—never mind, arms are too sensitive a topic. Let's use another example: selling motorcycles.
