[Parody]

Ditto: my main realm is all custom categories and mostly custom tag domains and I haven't had any issues. I also combine together information about character options or common world items into single Articles/Topics with Tag Snippets to say which books originally contained the information. Having just one Topic/Article for everything makes more sense to me than keeping with the book organization. You can already do that by using the books or PDFs directly.

If I were to speculate (and I do all the time! :) I'd say that one thing I don't do with that realm is imports or exports. I wonder if some of what folks have seen is from stressing that mechanism, especially during a time when no bug fixes were forthcoming. My Paranoia realm is also old enough to still use the Legacy game system, which is unlikely to change any time soon.