To start with, I know we can hover over the number of sats zapped to get the number of stackers, at least on desktop. I have yet to figure out how to do it on mobile, but that's another issue.
This morning I was preparing my ~bitcoinbeginners newsletter, and for some reason I was focused on the number of stackers who were zapping top posts. I started thinking that I would really appreciate having that information available when scrolling new SN posts myself. I know from experience that good posts often get ignored, and I think that having that information readily visible would be valuable. It would be an information point akin to number of comments.
It may seem like a minor point, but it seems to me that it would be simple to implement.
Another benefit would be to further inhibit Sybil blasting. A new stacker with a gigantic number of sats on a post with one zapper would be quickly exposed.