I think reports are finer grained, there are several reasons you can give for reporting, and it's dynamic based on your group, not a static list created by one person. So you could filter one kind of report, while ignoring another type, depending on your personal preference. It's Nostr so it's still a WIP, and not included in all clients. It is works in Amethyst quite well though.

To be honest I've never used follow packs either, if anything I might look through them to find people, but never just add a whole list without checking.