Its grammar is limited in ways we don't understand, because the grammar is based on abstractions of our experiences of the world and the relationships between t

Its grammar is limited in ways we don't understand, because the grammar is based on abstractions of our experiences of the world and the relationships between them. If we can't imagine entire classes of relationship - likely because we do not have limitless intelligence - then the model will always be a partial analogy, not a full and complete abstraction.