If someone tells me that they re running Greyhawk and gives me Greyhawk + Dragonlance, they were being dishonest with me.
There's a reason why when you order such tea, it's named Peach Ice Tea on the menu. That reason is it would be deceptive to call it Sweet Ice Tea, which gives the one ordering the expectation of ice tea with sugar, and then provide peach ice tea, which gives a radically different taste.
I'm not sure how the GM is being dishonest here though. They are not giving you Greyhawk + Dragonlance; they are giving you Greyhawk + High Wizards of Sorcery. The chassis, base, and just about everything else is still Greyhawk. They don't think that the change/addition made warrants mention or detracts from their own sense of a setting's integrity, in terms of "degrees of change" as gets thrown around in discussions here. It still constitutes Greyhawk for them (and possibly others at the table), so how are they lying to you? There is no deception. There is no attempt to cover anything up. I don't think their honesty is defined as being dependent on your tastes or preconceptions. It's their conception vs. yours. There does not appear to be any lying, dishonesty, or insincerity at play here.
We don't have to use ice tea as an example. We could use beer (with your imposition of a "setting Reinheitsgebot" in contrast with many craft beers making that an apt comparison) or sandwiches for other examples. A reuben sandwich is defined as having corned beef, Russian dressing, American Swiss cheese, and sauerkraut on rye bread. But if someone graciously made me a reuben with pastrami, Thousand Island dressing, Gruyere or Emmental cheese, or sourdough instead or with the addition of pickles, then I don't think that I would have a moral leg to stand on if I accused them of being dishonest in giving me a reuben. If anything, I suspect that I would come across as something of an ungrateful dick if I lobbed that accusation at them. Nor would I necessarily call it a "Homebrew Reuben." They made me a reuben, and I'm thankful for it. I may have initially expected a sort of platonic ideal of a reuben, but I still got a reuben sandwich and I don't think it's honest of me to accuse them of dishonesty for the sandwich.
You are also making a very poor argument there. You are implying that .000001%(a statistic you pulled out of your rear) and "a drop of some impurities) makes adding content from other campaigns unnoticeable. The fact it, it will be noticeable to the players or it wouldn't be added to the mix.
Except that it was not noticeable to the players as per pemerton. It's noticeable for you because of your own player knowledge, preconceptions, and sensibilities of what constitutes a "pure" game of a setting. It breaks your sense of immersion for Greyhawk. It seemingly causes you to break out into accusations of GM dishonesty! and establishing new settings called "Greyhawk + Dragonlance." That ultimately makes this a Maxperson problem and not a problem with pemerton's Greyhawk game or honesty as a GM.
Because a Greyhawk + Dragonance game is not a Greyhawk game, but rather a Greyhawk + Dragonlance game.
The fact that it's a mixed Dragonlance + Greyhawk game for starters.
Circular reasoning is indeed circular.
What it says is that the fallacy is strong with you. I never said that the presence of Wizards of High Sorcerery would cause me to expect gully dwarves. What I said was that a mixed Dragonlance + Greyhawk game would cause me to expect mixing of the two settings, and then I gave examples.
I don't think that my misunderstanding of your point should be construed as a fallacy. But your hardline preconceptions seem to be your problem and not that of the GM's Greyhawk campaign. You're setting those arbitrary expectations up yourself, and you have only yourself to blame when it causes you to expect further deviation outside of that.
Not in the context of this discussion. There needed to be a way of differentiating between an addition that doesn't touch canon(change) and and a canon alteration(change), so those of us on that side of the discussion settled on addition v. change.
You can need to accept those definitions for this discussion if you want to be able to give any sort of meaningful contribution about additions v. changes.
All additions are changes but not all changes are additions. I think we can all recognize that we are dealing with basic categorical logic and that our persistence at adhering to such confusing categories only obfuscates further discussion. If you need more apt terms, then might I suggest "addition" and "retcon"? A
retcon being defined generally as "a retroactive change of pre-existing continuity or lore."