What is a disadvantage of using templates without risers while drafting?

Using templates without risers presents the disadvantage of an increased risk of smudging primarily due to the surface contact with the drafting medium. When a drafting template is flat against the drawing surface, any pressure applied while drawing can cause the pencil or ink to spread outside the intended lines. This is especially prevalent with softer materials or in situations where the draftsperson's hand moves across the template. The lack of risers means there’s no elevation to help prevent contact between the hand and the drawing surface, increasing the potential for unintentional marks or smudges.

The other factors, such as increased difficulty in drafting or clarity of outlines, are not inherently linked to the absence of risers themselves but rather to personal drafting skill or the specific tools used. Overall, the main concern remains the physical interaction between the drafting oil, template, and the drawing surface, leading to smudging.