Cast a different light on, sure. Change? No.
I first saw Star Wars in (I think) 1977.
There was a romance between Leia and Luke. With no suggestion that the romance was in any way forbidden or wrong.
I first encountered the storyline for RotJ in a book version around the time it came out (I would say 1983). It "revealed" that Luke and Leia are sibiling. This changes the meaning of their (prior) romance - and the film makers clearly recognise this, as there is a whole scene between Leia and Han which clarifies that Leia does not feel romantic love for Luke, but only sibling love.
I don't have a strong view on whether that's a good or bad change, but it's a change. I don't think it had been thought of when the original film was made. I don't think the romance between Luke and Leia was meant to be some sort of foreshadowing - rather, the earlier film sets up a romantic rivalry between Luke and Han ("Do you think a princess and a guy like me . . .?" "No!").
I'm finding it hard to even follow the mental gyrations and pedantry necessary for this argument but I'm curious to see how far this goes...Did Star Wars canon change the minute they introduced Darth Vader in the first movie? He wasn't in the movie before he was introduced so that's changing canon right? Did they change cannon when the opening scroll proclaimed it took place in a "galaxy far, far away"? Before that it wasn't established where it took place... In fact everything changes canon according to your definition so how do we ever establish canon or lore since, according to you, anything added is a change?
Surely you recognise the difference between
a work, and a series of works that are meant to be, in some sense, about the same place/person/thing, but change the meaning of said place/person/thing?
Darth Vader
is Star Wars canon. His status as Luke's father is also (one assumes) intended from the start ("vader" being Dutch (? I think) for father.
But Luke and Leia as siblings I think was not. Or, if it was, it was poorly foreshadowed!
Some additions change the meaning of the thing they are added to. Suppose it was added into default D&D lore that a person can only become a warlock by making a human sacrifice. This would be addition to, not changing, the received information about warlock pacts. But clearly it would change the significance of being a warlock!
I find it amusing that someone who considers their subjective interpretation of the LotR canon... now disregards the implied elements of the OA setting to suit his argument...
What implied element? I don't think that OA implies that the worldview of "gajin" is correct. It implies that, in the OA setting, the world view of "the oriental" is correct.
The reference to "subjective interpetation" is also strange. Are you denying that JRRT's writing in LotR and Silmarillion deals with topics such as the Fall, the relationship of human freedom to providence and the divine will, etc? I mean, even if Tolkien hadn't told us as much (in his discussion of "sub-creation" in On Fairy Stories), it is obvious from even a cursory reading.
To be honest, one of the reasons that I find the way that some D&D fans approach "canon" frustrating is that they are more concerned with the minutiae of dates, maps, names etc than with the more fundamental eleements of theme, trope, etc. As if a work of art is constituted primarily by a list of elements, rather than the arrangement, interaction etc of key idea-expressing elements.
In the context of RPGing and D&D: if a revision of some point of planar geography, creature origin etc makes some game element
truer to itself, then that is not butchering or disregarding lore - it's honouring and enhancing it. (See eg the discussion of the metaphysics of undeath in the 4e book Worlds & Monsters.) Conversely, if an addition of some element makes a game element less true to itself (eg the way MotP presents all the pantheons as co-existing in the gameworld) then that is not respecting or preserving lore just because it is addition rather than revision.
The fact that what counts as the key ideas, etc of a work can be a matter of disupte doesn't change the above. It just means that commercial publishing is a risky business, because not everyone will think the publishers made the right call. Which I think is obvious. It also tends to mean that commercial publishers will err on the side of conservative and non-adventurous writing. I agree with [MENTION=6799753]lowkey13[/MENTION] that this can be ultimately self-defeating. I'm glad that WotC, at least on one occasion (c 2007-8) had the courage to do something more interesting.