Sounds like you are familiar with this topic. I dont have time to work more on this particular aspect (there are lots of other tasks like comment support, federation with Lemmy, etc). But contributions are definitely welcome, preferably directly to leptos_use
so that others can benefit and its easier to maintain.
What you list as disadvantages are exactly the main benefits of a federated wiki. For a contentious subject which can be interpreted in multiple ways, there should be multiple different articles which present these views. It can be possible to represent other viewpoints if they share a common root, but as soon as there is a fundamentally different understanding that breaks down.
Additionally, even a very large encyclopedia like Wikipedia cannot include all topics that users want to write about. For example when it comes to TV series, books or details about small places, it often doesnt meet the notability requirements and gets removed. So for these topics people need to use entirely separate platforms like Fandom (which are full of advertising). Ibis can allow all these topics to be present in a single network, accessible from a single user interface.