People like what they like, right?
Sorry I forgot to answer your quote.
And yes, people like what they like, and that is ok. However, Greyhawk is supposed to be something intended for everyone, and that includes people with different tastes than ours. And Greyhawk needs to accommodate for all of these tastes.
So, while it should remain faithful to its roots, it also needs to allow for the introduction of the new options that have appeared in the game for the last 50 years. It's a balance that is hard to get, specially with the current approach of WotC of not providing enough lore for the basic stuff.
And there is when we find our issue: there is people who doesn't want the setting to be adapted to the new lore of D&D. Part of the blame falls on WotC, they have been known for not caring about the inner consistency and continuity of their settings (see Forgotten Realms), and that may alienate some people. But in most cases, there is people opposed to the addition of modern elements just because they don't want them. Or, more to the point, they oppose to the addition of new, seemingly "original, unorthodox" elements (the dragonborn being the prime example of this), but won't object if an old-school element is added to the setting, despite if this element changes stuff in the process (my example of fruit elves replacing the Yeomanry).
And, well, Greyhawk is for everyone, not just for a few people who were lucky enough to have been born just in time to enjoy the early years of the hobby and feel entitled to some sort of exclusivity.
My own opinion is that both paradyms should coexist. New elements should be given the option to be added, without replacing old elements (unless there is a narrative reason for it).