Honestly, I find fedwiki disorientating. To achieve its own specific use cases, the wiki ends up being an app that navigates disembodied pages from across domains distinguished by colored flags, whereas I am more interested in having clear boundaries that distinguish between the actor’s knowledge (deliberately part of their extended mind) vs new inputs from specific sources. I have to go to another person’s website to see their view on things, but their website might provide functionality to help send ideas back to mine. This is perhaps more similar to a fediverse paradigm than fedwiki?
As far as I can tell, fedwiki’s ability to subscribe to changes is also limited to lists of activity, whereas I’m interested in being able to merge in new content from other sources.
This idea can apply to organisations/projects managing their knowledge too, but I think the emphasis on ownership of knowledge might still be different to your interest?
Rather than commenting or suggesting across the federation, if I want someone else to include my view on their site, I would do the equivalent of a pull request. (I understand fedwiki now has suggestions too, but I haven’t yet been able to work out how that works)
In terms of comments and suggestions, there is at least https://dokie.li/