Wow! Much more valuable feedback than I expected to receive. You have my upvote, sir.
I envisioned this to be a general purpose tool for information storage, beyond Hive-related topics. In fact, the idea was sparked from this article talking about other crypto projects being banned from Wikipedia. https://cointelegraph.com/news/just-like-bitcoin-before-it-cardano-is-banned-from-wikipedia
The issue with posting only a diff is you pollute other interfaces with junk posts. You could solve this by posting the diff in a custom-JSON operation, but you lose the visibility and the upvoting/downvoting/commenting social mechanics.
Valid points about edit wars .. we need to think about that a bit more.
I considered the option of keeping the content in a separate database for performance reasons, but decided against it. The content has to live on-chain, IMO, either in posts or under the surface in custom-JSON ops. The off-chain data would be a meta-index of the articles, which would be easy to rebuild by replaying previous blocks of the chain.
There is already an off-chain media wiki instance running for Hive specific information: https://www.beewiki.dev
Checking out Roam...