Every answer was at least one full, complete sentence, even for yes/no or true/false. And the “short answer” responses filled all available space when one sentence would do.
My only conclusion is that some undergraduate institutions around the world must be intentionally drilling it into their students to do this.
For example, if the question is about respiration a rambling answer that mentions “oxygen transport chain”, “Krebs cycle”, and “ATP” might get 3/5 points even if it doesn’t make much sense otherwise as long as the answer doesn’t confuse the Calvin and Krebs cycle or otherwise contradict like saying that glucose is a byproduct.
Practically speaking, there is fairly little downside to putting in extra in your answer, as tests are normally scored by how many points in the grading rubric you hit.