> they're able to understand and be understood sufficiently
Communication isn't all or nothing. The more expressive power you have, the wider the scope of ideas you can communicate. It may be minimally sufficient to be able to communicate "me hungry" or "that crazy", but more is probably still better.
Communication isn't all or nothing. The more expressive power you have, the wider the scope of ideas you can communicate. It may be minimally sufficient to be able to communicate "me hungry" or "that crazy", but more is probably still better.