Squishy Soft adds subtlety to strong lines and shapes
Squishy Soft is good for all kinds of subjects, from factual to moody to poetic.
A variable or squishy line adds sensitivity to the image. It also adds info e.g. to a line drawing, showing light and shadow with a thinner or thicker line.
And if the outline is soft and blurry, it can add an artistic edge even to a wheelbarrow. This style is mainly for images involving emotion.