It seems that the idea of Greyhawk as a unique setting with a distinct "flavor" is extremely overwhelmingly unpopular. So ok, turning GH into just another FR with everything and the kitchen sink thrown with no logic also seems to be the prevailing desired viewpoint. All good, just add every single thing from all the 5e/6e books and just who cares about GH as a setting, it's just stupid old thing anyway, right, it's basically just throw away trash if it's not "super current"? All change is good, no matter what, because change.
Who cares, wotc can do no wrong, they are perfect, especially now a days. So ok I don't have any more energy or time to fight the tidal wave of wotc can do no wrong and GH is stupid anyway so let's change it all to make it exactly the same as FR or whatever. I have an actual d&d game to prep for, so I leave the 6e GH/FR or whatever it is to the all the brand new day 1 customers and carry on enjoying other things. That's the message, right?
I've said many times what I really think, and how it would make sense to add stuff to GH in really good way. But that doesn't matter, it's all or nothing. If you want to preserve anything from the past setting you are the "enemy" basically, out to do evil for "bad" reasons. Change it all or you are not welcome is much more of the message.