I mean they appreciate their lines, and the fact that they have the IP you can see that with the fact that they have 5 lines and are working on a 2nd edition to the first line, but that doesn't mean they should neglect a simple duty to at least correct basic typos and include the materials and tables in books they left out (like the Book of Judgement).
Oh, no doubt, I agree completely. My post was meant as a statement of facts and a commentary, not excusing FFG's apparent fire-and-forget policies.
Dark Heresy hasn't been Errata'd since 2009. More than four years down the line, since they haven't kept it up to date, it must appear as a monumental undertaking, especially if you take the latter lines and books into account.
But it only got that way because of their own neglect. I have no idea why they don't keep running internal documents with a compilation of changes and fixes, to quickly update erratas regularly. It's a bit ridiculous.
Now that they're dropping Dark Heresy 1st Edition, any incentive on their part disappears completely.