What is the difference between loadable and system families?

The distinction between loadable and system families in Revit is important in understanding how different elements are created and manipulated within a project. Loadable families are indeed editable, which means they can be created or modified by users through family editor tools. These families allow for customization and can be saved with specific parameters and types tailored to the project requirements.

On the other hand, system families are built into the Revit software and cannot be modified in the same way. They come with preset configurations and cannot be created or edited in the family editor. System families are essential for elements that require consistent behavior, such as walls, floors, and roofs.

This fundamental difference highlights the flexibility offered by loadable families compared to the rigid structure of system families, making it clear why the assertion that loadable families are editable while system families are not is accurate and informs users about the way to effectively use these two types of families in their projects.