I'm new to SWE and I wonder if ECP is just a demo. Demo that will evolve and will be useful one day.
You search for a component and find it in a bundle of 1000 other components. As there is no preview for component information you need to download 1000 components. Then you have an option to import only the component you looked for or all components in the bundle.
At this point it's possible to see component you just imported does not contain circuits or other important information. And looks like 3D part file is never included.
One SWE competitor has portal like this: