Here's a super overdone and oftentimes overthought topic - the canonicity of Michael Kirkbride's current works, but I've never discussed it on here and I'd like to.
For those of you that aren't aware of who MK is or what he's doing now, MK was a leading lore writer, concept artist and dialogue writer for Bethesda during Morrowind. He also helped out quite a bit with Knights of the Nine. MK is responsible for some of the most lore heavy and metaphysical topics, books, and dialogue in the Elder Scrolls series of games. After Morrowind, MK left Bethesda for unknown reasons, but continued writing Elder Scrolls metaphysical works after he left. Up until Oblivion, most, if not all of his works could be 100% considered canon or potentially canon. But, when Oblivion came out he and Lady Nerevar started writing joint works that some questioned the canonicity of due to partial or complete in-game conflicts. Then Knights of the Nine was in dev and MK was brought into the project where he helped with lore writing. In addition, he wrote the Mysterium Xarxes Commentaries, which is also a great lore document. After KN, MK left Bethesda again where he continued to write. MK was responsible for quite a few works after KN, and quite a few ideas that Bethesda used in Skyrim and its DLC, the most notable of which being the Thalmor (which was also used the Elder Scrolls Novel books). In addition to that, MK's work was also referenced several times during Skyrim by NPCs like Heimskr, Paarthurnax, and a few others.
Now you might be saying to yourself "Well, if all that is true, then his work must be canon." Well, there's another side to the story.
Michael Kirkbride wrote quite a few short stories, poems, etc that absolutely and completely contradict in-game lore, some of which was previously written by himself. A couple examples of this are Landfall, which contradicts Alduin's Wall, some of Almalexia/Vivec dialogue in Morrowind and the information given to us in Morrowind and Daggerfall about Aetherium and the Numidium by Sheogorath, Vivec, Dagoth Ur, and others, both in dialogue and books. C0DA is another example of this, as it actual contradicts the Book of Hours, which are a series of books in Morrowind written by MK. The 36 Lessons of Vivec was, admittedly, quite general in nature, so, obviously, it by itself doesn't contradict MK's works, but the way its ideas were explained in later games does contradict his books, based off of Oblivion and Skyrim books, Greybeard dialogue and Septimus Signus' dialogue.
So, is Michael Kirkbride's work canon? Honestly, I don't know. Zaric Zhakaron made a video called Canon vs C0DA on the subject, and I think he really hit the nail on the head. Some of MK's work was used by Bethesda because it is all their intellectual property, but just because some of his work is in the game doesn't make his ever-expanding inter-dimensional universe canon, and just because some of his works are not canonical doesn't mean that they are bad ideas or that Bethesda won't continue to use them later in the series.
What do y'all think about it all? I'd absolutely love to hear your opinions on the matter. Also, please, no flame wars, this is just a civilized discussion.