Yes, it's also really buggy. One of the API calls return bad data (after the mac wakes from sleep). Side loaded extensions get corrupted on some macOS/Safari updates requiring the user to fully reinstall apps.

They make reporting bugs impossible because you can't just reproduce it by updating your OS again. Native app messaging is done through shared data which forces you to poll for updates.

Urggh. I wish they could just own up to the mess (like Microsoft did) and fully move to Web Extensions, including native app messaging.