Indeed. To me "native" implies that the app will also use the typical keyboard shortcuts that are native to the OS. For example, copy to clipboard via Ctrl+C on Windows and Cmd+C on macOS. Is that the case with Xi?
As currently architected, the frontend is responsible for sending the core events such as "copy", "delete to start of line", or "insert 'a'". On xi-mac, the default experience is intended to closely match the behaviour of other native Cocoa apps, and to generally respect platform idioms.