The more powerful and formidable the magical powers and divine skills are, the more difficult they are to cultivate. They require extremely demanding conditions and an immense amount of time. Therefore, each cultivator has a limited number of magical powers and divine skills they can master. After all, their lifespans are finite, and the cultivation of such skills is extraordinarily difficult with an expenditure not everyone can afford.
Cases like Yan Moshan directly receiving an inheritance do exist, but they are extremely rare. No one willingly hands over the fruits of their hundreds of years of labor to someone else unless specific circumstances force them to do so, and the likelihood of that happening is quite low.
It can be said that Yan Moshan has encountered incredible luck to have an expert like Hatred Demon Sovereign directly extract and bestow upon him a Great Divine Power into his body. The benefits Yan Moshan has gained are enormous.