At this stage, one wouldn't be able to grasp it without a powerful talent. Normal martial warriors wouldn't be able to reach this stage even if they cultivated for their entire life.
This was sad but it was the best portrayal of martial arts cultivation.
Thus, many martial warriors would rather spend their time cultivating their Forces than waste too much time enlightening themselves in these areas. Many martial warriors stopped cultivating when they reached the normal stage. They didn't need to spend more time cultivating.
To them, obtaining the power of origin was more cost-effective than continuing to obtain the power of domain.
The integration phase domain was powerful but the power of origin was equally powerful.
With the help of the power of origin, he was able to fight with the integration phase domain.
Of course, if you were able to grasp the integration phase domain within the same time, you would have an advantage others didn't.