Your topic took me to back to my time when i was working as a CR ,I had a grievance regarding Steem Curators . If a curator votes on a post, they should ideally provide a brief (short) feedback related to the content. I believe Steem Curators' votes are encouraging in themselves. However, with upvote a one-line comment motivates users to produce better work.

For SC curators comments , A simple example of this is, posts in the Steem POD Team community, which curators regularly vote on, but you might rarely see comments from sc01 or sc02 on one or two posts. Instead, only votes are cast. And I doubt those reports are thoroughly read, except for a few. Don't you think that along with their upvotes, comments should also be used to encourage and motivate them for their work.

Nevertheless, i realized two days ago that it's not necessary for a curator to comment if he is voting to a post which doesn't align with their reading preferences. They may upvote based solely on post quality and presentation.

I felt that during my moderation duty. As I reviewed and upvoted users' posts, I also left relevant comments to some posts. However, for topics not aligned with my reading taste, I applied the standard moderation procedure.

These were my thoughts. However, everyone here has freedom - both Curators and users. If they comment, they'll receive a reply. If they don't comment, that's okay too, as I understand Curators have numerous responsibilities and time constraints.