The formation of the Mud Sea signifies a Lower-level Divine Person, and this is the initial realm that all Ascenders most dream of attaining.
Of course, the Divine People born and raised in the Heavenly Realm have no such troubles, as they already possess a Mud Sea in the womb. Thus, upon birth, their Mud Sea is defined, and they are born as Lower-level Divine People.
However, aspiring to become an Intermediate Divine Person, which involves cultivating a Mud Pill, relies on one's own cultivation and a myriad of resource supplies beforehand. Without the proper qualifications, one could spend their entire life and still may not achieve the status of an Intermediate Divine Person, nor cultivate a Mud Pill.
Transitioning from a Lower-level to an Intermediate Divine Person is a hurdle—a significant one.