Comment by sherry-sherry

The app has always followed the masOS design language, because the app is built using the native macOS tools. It makes sense for it to match the OS it's on, apps built with stand UI components migrated to 'Liquid glass' much easier.

The app is open source (https://github.com/Ranchero-Software/NetNewsWire), feel free to back-port any features or bug-fixes you would like to spend your time on.