What is the primary purpose of using the Tangent Propagation feature?

The primary purpose of using the Tangent Propagation feature in SolidWorks is to maintain geometric continuity. This feature is particularly valuable when it comes to ensuring that surfaces or edges transition smoothly without any abrupt changes. By using Tangent Propagation, you can create features, such as fillets or curves, that not only follow the contours of existing geometry but also ensure that they are tangent to those geometries. This results in a more aesthetically pleasing and functionally effective design where surfaces blend seamlessly, which is especially important in scenarios like aerodynamic or ergonomic designs.

While it might enhance visual clarity to some extent or allow for easier fillet application, the main focus of Tangent Propagation lies in preserving that smooth transition and continuity in geometry.