The post was made in the news@lemmy.world community and other posts linking to the same news article were made in technology@lemmy.world and in askusa@discuss.online. 3 different posts in 3 different communities.

PieFed de-duplicates them and only shows the post once in the timeline and when viewing the post all the comments on those 3 posts are shown in one place.

The fragmentation problem is solved.

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[–] mosiacmango@lemm.ee 9 points 4 days ago* (last edited 4 days ago) (1 children)

That's a pretty good methodology. Threads are still distinct, but all on the same page at least. Hopefully lemmy can implement something similair.

I would reduce the distinctiveness of the threads, personally. Lemmy/reddit/etc commonly have separate subthreads on the topic same page, so its not like it needs to be a prominent feature that each subthread is from a different comm. Note it maybe, but less prominent seems better.

[–] fxomt@lemmy.dbzer0.com 18 points 4 days ago

A couple of issues with little to no distinction:

Community rules. If 4 communities were in the same thread at once this would be harder for moderators to moderate, and for users to follow the rules/report. Since they can't tell easily from which thread this comment comes from
Threads are not always crossposted with the same context. Example:
https://lemmy.dbzer0.com/post/40368868
https://reddthat.com/post/37396001

These threads are posted in different communities, their comment sections would be very different