Hussar
Legend
I've already answered this multiple times. It's about expectations. If someone tells me that they are running a Greyhawk game, I expect Greyhawk and nothing else. If they are going to add other things like Dragonlance, they need to be upfront with me and tell me that they are running a home brew setting mixing both. Then I'd expect things like Gully Dwarves in the Barrier Peaks and Wizards of High Sorcery in the Great Kingdom, so there wouldn't be an issue.
But, all this tells us is that this is your personal preference. These are your expectations, not anything we can establish a general consensus on. By then adding a value judgement, you are extending your personal preferences onto someone else.
Nowhere is it written that if you announce a certain campaign setting, you may not make any changes to that setting. In fact, the opposite is most likely true since virtually no home run campaign never adds any additional material.