Yep, exactly. You can now use the "Joints" function between the different components to help align and constrain the parts, which helps create a robust parametric model. With Fusion, you really want to use Components when building assemblies. Think of it this way: Components are the individual parts, bodies are the geometry that make up the part. Just as an example, most of my simple designs *usually* end up with one body per component (although you may see multiple bodies in the timeline used to help build the final component design).
For a typical workflow of a simple assembly, you'll create an initial component and constrain it to the WCS. Then, as you build more components, you'll assemble (i.e. constrain) the different parts/components together with the Joints.
