The most important aspect of generating parallel space is the need for a main reference space. Both division and differentiation can create permanent parallel space, but the difference between the two lies in energy savings versus energy consumption.
When Zheng Yichen uses Parallel Differentiation, the overlapping of parallel entities leads to multiple energy consumption, which counts as action consumption rather than consumption during differentiation. This is considered temporary differentiation.
If it were a one-shot deal of permanent differentiation, the initial consumption would be even greater.
In contrast, division is much simpler. If he could apply it to himself, he could directly split his strength in half, with very low initiation consumption, allowing for permanent differentiation as a one-shot deal.
The price? Halving one's own power, which doesn't equate to halving one's level, nor does it turn oneself into a weakling, as the quality is still maintained.
