This idea is based on YouTube playlist / Google Drive share link visibility settings, which allow "private", "unlisted" (only people with the link can view), and "public".
For most of my saves lists, I don't care about them being private, and actually could potentially find it useful if I could share them with others.
I have a list for feature-requests I want to see implemented. If I could make this public, I could show people what I care about.
I have a list for guidance I often give to other users that isn't as well covered in the Help Center. Imagine if I could just throw the entire thing at a new user who's curious about learning the network more deeply?
I have a list on SO of ChatGPT posts that I still want to take certain actions on. I could share this with "unlisted" visibility to other users in the AI Domination chat room and AI heuristics group.
I currently put a list of answers I'm proud of on my SO profile, but the character length limitation is a real pain in the butt. If I could stuff those into a saves list and just link that in my profile, that would be nice. Of course, I could just workaround that by hosting the list somewhere else like a GitHub Gist, but I've kind of gotten brainwashed into having a thing against off-site links.
I just saw Collections: A New Feature for Collectives on Stack Overflow (which lists motivations such as "resource showcase" and "content maintenance" (which I've touched on in my examples above)) and thought to myself- "if we could make public saves lists, basically anyone could do something akin to this" (except without collaborative editing I guess).