Not over something like encumbrance I didn't.
You're engaging in a Strawman. Changing the setting was not the criteria. How about you argue what I said, rather than the changes you keep tossing my way.
So what.
Fairly sure both Warlocks and Psionicists are included in FR material. Not sure what a binder is.
If you need to ask this question, you haven't been paying attention.
Binders were added in 3.5 in the Tome of Magic. They're more or less the base for the 5e Warlock, at least a large amount of the flavour of the 5e warlock owes its DNA to the 3e binder. One of my absolute favorite classes.
But as far as your "so what" goes, well, I'm not quite sure what you're not understanding. If adding a completely new class - Binders, Warblades, Hexblades, Warlocks, Psionicists, Wild Magic casters, etc.
isn't changing the setting, then why is adding a Wizard of High Sorcery such a huge change that it makes Greyhawk no longer Greyhawk?
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See, this is why I have such a problem with the distinctions being made here. Sure, we can all agree what homebrew means, as far as a campaign goes. If you're playing in a homebrew campaign, then the setting you are using is likely your own creation and exists only at your table. It might resemble other settings, or not, but, it's largely the creation of that particular table. Fair enough? Everyone on board with that?
But, as far as the idea of a homebrew/hybrid and canon game goes as a distinction, it's largely pointless IMO. The only really canon campaigns you'll find are Organized Play. As soon as you go outside of Organized play, the odds of a campaign being canon are virtually zero. What's the point of arguing over which campaign is "more" canon? If one campaign adds Warblades, Warlocks, and Psionicists to Forgotten Realms and a second campaign adds (not removing existing casters, just adds) defilers, what's the point of trying to say one is "more" canon than the other.
Again, it's arguing over who is more blue. What difference does it make? You're both bloody smurfs.

And even within a given edition, the canon of a setting changes, sometimes with complete retcons (wild mages are added to Dragonlance in a retcon to make them fit in the setting - they've always been there, just in the deep history, only making a reappearance in the final age of the setting).
Sure, I agree that canon is a good place to start. You guys had a very interesting campaign kernal starting with the idea of one of the dead FR gods bringing Defiling to Forgotten Realms. Very cool idea. That's what canon is best for - inspiring cool ideas. But, this idea that you can make value judgements about other people's games based on canon privileges canon to an uncomfortable degree. Never minding the inconsistencies that this brings out - is it a "change"? What does "change" mean? ((Hell, what does "can" mean?

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If you need to invent new definitions to words in order to defend your point, perhaps, just perhaps, your argument isn't quite as strong as you might think.