In the foundation establishment stage, the number of life seeds in the body increases from 1 to 1,024. Each one will contain 1,000 units of energy, so a cultivator at the peak of the third mortal coil will have to control energy that it is worth 1,024,000 units.
Not only must they control this vast amount of energy, they also have to make sure that their bodies aren't torn apart by the energy or forced to explode.
Even if one can control all of the life seeds at once, one has to be able to use all of them to execute the same task at the same time. Only in this way will the advantage of quantity become fully realized.
To him, he understands this in terms of core count in the CPU of his past life and how it affects their computing performance. Each life seed can be likened to one physical computing thread in a computer CPU.