Oh, it is, many missing features, several come to mind: no way to mark anything as read, not even notifications, you can't open the profile of a commenter, no saving images...
But the UI is pretty, you can already save, vote, and reply to stuff, and development is active. But clearly there's good reason for the app to only be on github for now. It's my favorite so far in terms of UX.
Consider uninstalling jerboa and switching to another app like liftoff, summit or thunder, which didn't enforce v0.18. You might end up waiting weeks if not months.