I totally agree on the first point, and might have a response in this thread stating much the same.
On the federation/syncing, I think it might need a more unique approach. Communities already have the problem of multiple posts linking the same article across several instances and communities, which don't sync comments. Making sure the complete wiki for a given community is resilient to instances defederating, shutting down, or vandalizing should be top priority, IMO. I don't know what the solution is, but I think we should be open to it looking different from the basic Lemmy sync setup.
For example, the wiki/extracted posts don't really need to sync as quickly as thread comments. Also, there should be some form of versioning in case of a credentials bug, hack, or intentional mass deletion or vandalism. We could aggregate points of conflict between instances/communities in a topic's main thread/stream/article and assign some for of weighting alongside the choice to continue reading from a particular wiki, which are return to the original thread/stream/article.
So, in the Biden-lizard example, the primary Biden entry that's synced everywhere could have a "Controversy" section with generally agreed on, real issues (like age, which is true for almost all US politicians) and fringe disagreements. Each fringe entry in the list would link to the page synced between instances that subscribe to those beliefs, but that page would not be a part of the larger synced Biden pages' contents. That keeps the lizard lovers' content off the larger, community-focused instances.
I guess I'm worried about conspiracy theories pulling users of the 'realistic' path, while increasing load on dissenting instances. I don't think Biden's a lizardman, so I shouldn't have to host the 12 hour long documentary on it. (We all know he's a reincarnated demon-angel hybrid. Oh, so now you don't agree? Fine, I'll host my 36 part finger puppet reenactment of the situation myself!)
Anyhow, I'm kinda babbling. These are just some general ideas off the cuff I wanted to get out there. I'm not a mod or an admin, so I'm hoping to get the conversation restarted among those with the ability to enact some of these changes. Reddit is still a knowledgebase of useful past discussions, and while new content is great, the more we can pull into the fediverse, the better.