> Sure, you could show all the attachments for one person in one place. But when would I use that?

People often remind me that they sent me some file a few weeks ago. This happens to me pretty frequently, a few times a month. Right now that turns into a spelunking session (although mu4e helps a lot) but if I could just see all the attachments from that person in reverse chronological order it would make it much easier for me to find things.

For what it's worth, features like this would be hugely helpful to me in my work.