Right you are! Sugar and Shortbreads have VERY little moisture to begin with.
Working too much flour on the table makes the dough dry, crumbley and changes the flavor.
Overworking the dough forms gluten which makes the cookie dough tough, dry and causes shrinkage.
Shortbreads are so delicate they are somethimes pressed into a pan and baked rather than rolled and cut.
Are these the issues you are having?
The other cookies have more moisture and fat. Hygroscopic sugars are used (ie brown sugar, honey, corn syrup, molasses.) in many drop cookies keeping them moist. |