Because, Xia and other masters, their early six-hexagram books were very utilitarian and played badly, but even the most basic things in them were wrong. Many divination cases have been slightly modified by other divination cases, resulting in some divination cases not focusing on the interpretation process.
The books written by early masters and even many masters can't even use the twelve immortals.
However, the criticism of good or ill luck is not very accurate. The theoretical argument is that Zhu and Li Guang have slightly different theories about some energy levels and three tombs.
But in any case, the most basic part of their things is consistent and reliable.