The issue with Friendica, compared to Lemmy/Mastodon/etc, is that you'd need your friends and communities to also move to Friendica, which hardly happens
Considering there is a Debian 12 based version available and the latest Ubuntu-based one is 22.04, it does look like they're moving towards Debian. They don't seem to be the only one to do it, I've heard Linux Mint team is supposed to make LMDE their main distro at some point in future as well
I would imagine one post preview with a very compact list of instances on which the posts were posted so that you can enter either of those posts' view.
Or merge the posts into one view, show somehow it's a merged post, and merge comments as well (and let you choose the instance on which you want to comment if you create a new top-level comment).
Reddit had similar issue but it wasn't that bad since you hardly ever had 2-4 similar communities - something that appears to be very common with decentralised lemmy.
Meta trying to blame and put responsibility on someone else? That's a first 🙃