The second piece of D&D canon, which throws the whole concept of canon for D&D into doubt, is that of the home-table. As many WotC writers and developers have said, although there are several "official" or "canonical" explanation for ever world and the multiverses cosmology, none of them actually impact people's hometable. Meaning, when you play a game of D&D at home, you do not impact official canon in any way; even if you're playing in Forgotten Realms, you are in effect playing in a "fan fiction" FR, one that has no impact on actual canon. For this reason, you can kill the entire Council of Waterdeep, and you're not "playing the game wrong." It is your table.
Actually, that is not how I understand canon with regard to D&D and "home games". I understand home games to be actually defining the canon.
My table treat canon the same ways it cames to be used as a word. With the biblical canon, you're free to consider so-and-so's gospels, but only these ones are the "true ones", said the one empowered to make this decision (the church leader, I guess, or a gathering of church leaders). As a result, the Syrian Church, the Orthodox Church and the Catholic Churches all have a different list of texts considered canon. Because there is not one canon, it's just the accepted events as decided by the one given authority to decide on this matter. And many concurrent canon can and do exist. Each faithful is expected, I suppose, to abide by the canon of his church.
My understanding on the usefulness of canon was to provide guidelines for writers in an universe where the main author is allowed to have its say. "No, ou can't have Jedi Dave kill Palpatine before ROTJ in your book, because we'll need him" or "What happens to Luke after ROTJ is off-limit, he can't become Jedi Dave's apprentice". Because when allowing Dave the Scifi author to publish a book in Lucas universe, Lucas is obviously empowered to establish limits. Same with Disney, more recently.
By RAW, (p. 6: the Dungeon Master is the authority on the campaign and its setting, even if the setting is a published world.) and in my game, the playing group is the one empowered to make this decision because it's obviously what is mattering. If the PCs kill Laeral Silverhand, she'll no longer be there. Even WotC isn't empowered to bring her back, and any subsequent book featuring her will be non-canon. Because at the table, the official authorial power is shared by the players, not external writers.
This tends to remove most problem with canon, putting the perspective back where it should be. If you don't like dragonborns, they just don't exist in your greyhawk. Why would the publisher have a greater say than the DM on what is happning in his game? If you don't like Eberron to lie somewhere as an unreachable island in the greater 5e cosmology, why would Keith Baker be more empowered than the DM to say it is? Canon events are to be respected, though, once they are deemed canon: I'd be miffed as a player if suddenly, the DM decided to retcon away dragonborns from a running campaign, where we have established them to be canon...
We basically reach the same conclusion, except where you suggest we ditched the notion of canonicity altogether, I just propose we remember who is the official canon-deciding authority in an RPG (and it's not the publisher... nobody fudged any monster stats, ever?)
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