Maybe if the cross post could be identified and the comments merged into tabs where you can jump between them for the same post. So instead of 5 copies of the same link showing up with 5 sets of comments all of them are merged to one and when you click on the comment section it allows you to cycle through all of the different instances discussing it. It would clean up the feed but still allow you to see what each group is saying and where they are saying it.
I’d love to have a link for a news article wheee I can jump between what all the various instances are saying so I don’t miss anything.