Most of them need to go through complex preparations or refining; some ritual materials are as valuable as crafting a Magical Treasure.
Mo Huitou didn't dare guarantee that a certain backup material would definitely work. It was always several kinds; you tested them first, and then after combining, tested again before making sure.
By the time of the seventh generation Family Head of the Wei Clan, the rituals had lost their power for a long time, and most had been lost.
Even though that seventh generation Family Head was a prodigy, he didn't even have the basic materials or basic environment, so what's the point of his research?
For example, give those lost rituals to Yang and have Yang find substitute materials.
Mo Huitou's one-day work progress would be enough for Yang to work on for a hundred years.
This has nothing to do with talent or knowledge, it's purely a fault line in the development of certain eras.
