This is exactly the same very partial logic about communication as the movie Arrival. A race able to build spaceships would not speak with 3 word sentences. The information content is just too small. Also, if they are able to solve equations, they are able to talk about time, and space, events, variables. They would of course find a way to communicate besides just repeating the same words all the time.
My main issue is not so much that the episode falls short in the logic, but that it is rated so high. It does not deserve 8.7, especially with such episode as drumhead rated at a similar level.
Review of Darmok
