That's a tough question but thankfully, our team is on it. Please bear with us while we're investigating.
@motor-js/engine is headless package, providing React hooks and contexts but no actual UI elements. @motor-js/core is a much larger package which contains UI components, charts and a theming framework.
Due to the advantages that a headless library offer, we have decided to focus on enhancing the engine package. This offers more advanced hooks for complex use cases and enables any UX library to be used on top of the engine.