It is an interesting question. I am not sure. The style is from a YouTube channel I followed to learn about automatic1111.
I included the expanded version of the style for duplication purposes. I get better results with it on and the sfw style certainly keeps the model behaved.
I have also had very good results without it. It seems that just casting a wide with a few batches will yield at least one or two useful images, regardless of using the styles.