When Jin performed the Astral Imitation Style, both the System and Lynn were astonished how he managed to copy the attacks.
This was because the skills are associated with a certain animal style and most cultivators had been restricted to use based on the animal they had been affiliated to. While there had been cultivators who were able to change cultivation styles mid life, many did not succeed because they could not find most of the manuals out in the open to be compatible with their chi.
That's why most cultivators followed their familial cultivation styles because that particular style already had the best compatibility with their chi. Only certain talented cultivators would take up a double cultivation style should their chi allow such compatibility and that was how the Royal Zodiac Clans managed to stay in power for so long.
