The default shape is mostly used by people such as camokid11 and hobbnob who use it to create complex collisionmeshes without creating lag. It is more versatile than convexhull and is more useful than staticmesh
Benefits of the default shape
The default shape allows the user to create complex models that have accurate collision parameters, allowing for a more realistic experience.
Reasons why it isn't used
Many users are not aware of the default shape's potential, thinking of it as the same as the box shape.