I agree, but having more slots on the app doesn’t necessarily mean that the student feels pressure to fill all the slots.
My son felt pressure to choose meaningful and impactful activities to fill each of the 10 slots on Common App, but he didn’t feel the same way about the 20 slots on the UC app. With 20 slots it seemed obvious to him that they didn’t expect all to be filled, so he just filled in as many as he needed.