When would I use a Cut-Away Stabilizer?

Soft 'n Sheer and Cut-Away Plus Stabilizers are recommended as backings to add stability to the embroidery of goods with a delicate hand where the embroidery can pull down or sag from the surrounding fabric if left to stand alone through washings and wearings; also, for dense embroidery designs, open weave fabrics, or lightweight fabrics when stitching a complex design.