The problem with Wikipedia is not consumption of content, but the contribution of content.
It all sounds utterly reasonable from the point of view of the community, who is most exposed to very low-quality content, spam, and vandalism. But newcomers mostly see a big bureaucratic machine rejecting their first attempt, per compliance with some long established policy whose full printed details could threaten a rainforest.
The problem is the rules are often (not always) there for a reason, and everyone involved has good intentions (assume good faith! you can generally assume good faith!). But it's definitely not always a pleasant experience for new users, and that's not an easy problem.
It isn't adherence to strict rules that is the problem. It's the massively toxic little kingdoms that have become established among power users/moderators.
Like it or don't. Them is the facts.
I wonder how a distributed architecture where each king operates its own kingdom is going to help with this problem.
(And yes, it is a problem, but also essentially a part of human nature. You can't fix it, only mitigate it)
If you see a kingdom, in principle and in practice the emperor has no clothes. No single person has any special power or ownership over articles. If someone acts that way, you get to tell them what you think of it, if you like, and you'll very much be in the right. And if you are, others should agree and side with you.
There aren't moderators as such, people are supposed to talk to each other, directly. If you don't like how someone seems to act like they own the place, it won't change unless you tell em how you feel!
The thing is people who aren't afraid to give their opinions tend to talk over quieter people. I'm afraid I don't have a very good cure to offer, but please don't feel like anyone's too big of a power-user to have a little respectful, civil chat with. Please, template the regulars! They either respond politely, or they lash out and make an ass of themselves in public.
The problem is the rules apply equally to everyone, but the power users know exactly where the line is and how the bureaucracy works. "The law, in its majestic equality, allows administrators and newcomers alike to revert edits per policy, report 3RR violations, and open AN/I threads about people they don't like"
Which, for their flaws, do sometimes produce results.
1. Be sufficiently hardened and responsive to mass bad-faith attacks, from trolling to toxicity to coups. 2. Be gentle, welcoming, and patient with newcomers, making it easy to join the community and learn the norms.
Most systems fall somewhere imperfect on the spectrum between the two, with rare exceptions going almost entirely to one extreme or the other.
While this is likely true (though not quantifiable), I would add there is also a pattern I've seen play out where somebody gets really into Wikipedia, starts stablishing turf on some subject, goes a little power mad, then gets knocked back by rules designed to keep such people out of power. Said editor then leaves Wikipedia in a huff, and a prolific contributor is lost -- but it's broadly a good thing.
To me the main argument for decentralized wikis is when a community wants to capture deep subject focused knowledge. It's why I created https://wiki.osdev.org. Wikipedia is great but at it's core it will always be an Encyclopedia with a large breadth of knowledge. Specialization in a field is best handled elsewhere with links out from Wikipedia if possible. Especially when there will be original content.
Hyperlinking is all the decentralization you need in some cases. Activitypub for wikis is of interest for people contributing to a collection of specialized knowledge. No one is going to subscribe to all the specialized wikis of the world except maybe search/aggregation systems.
Wikipedia wants to be a specific thing with a specific scope. Where that line should be is debatable, but it will eventually be drawn somewhere. No matter where you draw it, someone will be on the other side of it.
However, mediawiki is open source. The licenses of content are cc-by-sa (similar to gpl). You can start your own wiki. Similarly licensed content can be moved back and forth if rules change.
Perhaps this is just manual "federation" in a sense, but the ecosystem supports it. I persinally believe this is one of the reasons why mediawiki as an open source project should be a core part of Wikimedia's mission.