Should I add additional comments to my UC application?

My ETS advisor says I should include something but the problem is that I don’t have anything to add. I have already extensively explained my challenges and how they affected me in school. The only thing i did not add was my economic challenges, but that did really affect my grades so i feel like that’s not really worth mentioning. How would it look if i add something vs if I don’t? Or does it matter at all?

If you have nothing relevant to add to your application and essays, there is no reason but anything in the additional comments section.