Hello LJDawson, let me start with saying how happy I am to have Sync back :)
The one issue I have with Lemmy is duplicated posts between different communities (see screenshot). Posts usually have same title, author and link, yet differ in community/server they are posted to. It would be great to be able to make the appear as one item on the feed with some note below that links to both instances' posts, or something like that basically to make them not appear twice or thrice one under another.
Yeah, I also think this is more of a Lemmy problem, rather than sync one.
Even if they are called the same at the end of the day they are different communities hosted on separate instances.
Just because it's a Lemmy problem, doesn't mean Sync can't do anything about it, for it's user's benefit.