Why can't data be connected on a line segment?

Data cannot be connected on a line segment because it often represents discrete values or categories that do not have a continuous relationship. In many cases, data points are distinct and should not imply a linear progression or interpolation between them. Additionally, connecting data points can misrepresent the underlying relationships, especially in cases of non-linear or categorical data. Thus, visualizing them with line segments may lead to misleading interpretations.