To reach the Realm of Water and Fire Emerge, one must start cultivating both from the very first tier.
However, cultivating both simultaneously can be problematic. To continue cultivation without killing oneself, one needs to reach the Realm of Water and Fire Emerge early on.
Even if one manages to achieve it early, the speed of cultivation will be forcibly slowed. Whether one can continue living and cultivate to the Eighth Tier is a big question.
Therefore, because of many issues, the incarnations in the Incarnation Realm could either be cultivated or not, depending entirely on the individual.
From the beginning until now, the most important use of an incarnation is actually not to cause trouble.
After all, an incarnation itself can be a major flaw. There are ways to use an incarnation against the original being, which is why many Cultivators in the Incarnation Realm do not cultivate an incarnation at all.
