When a cultivator dies, it is not always guaranteed that his soul can escape successfully.
One has to be incredibly lucky or any other medium that could protect the soul from escaping from the body.
After that, it required a good amount of Cultivation Resources to regenerate the new body, which most cultivators could not afford and had to wait for thousands of years, like Aron, who waited for three to four thousand years.
However, there was one great advantage in regenerating a new body and it was the cultivation talent and affinity of the cultivator increased greatly compared to his old body.
The top sects have already tried these methods; however, the success rate of protecting the cultivators' souls was very low.
Even the Celestial Dawn Sect, with a magic artifact that could collect and protect the cultivator's souls after their death, has a very low success rate.