Funny you should say that the Disillusion ending is the worst: it's also one of, if not *the* oldest. It's rarely seen updates, as Angela has preferred focusing on new content over re-writing old stuff.
Which strikes me as a good plan, because as the game changes through production fixing and re-fixing older content to keep it up to date with the latest changes will add a lot of extra work that ends up being cut in the long run.