Comment by psychoslave

Communication is not only about being able to make sense of what the utterer expressed. As tricky as it can be, that's still the easy surface level part of the issue. Gaining an intuitive and empathic equivalent representation is the nub of mutual understanding. It actually doesn't even need elaborate language to be operative.

The famous "how does it feel to be a bat" also comes to mind as a tangent consideration.

Two people can just exchange a sight, and both understand what the situation means and what each need to do to reach a common mutually beneficial ground.

Two people might exchange at length with highly technical vocabulary and still both feel deeply not understood.