D&D was created from a specific place and time- 70s America. Because of that, early D&D necessarily contains artifacts that are of its time; whether it is the "cheesecake" art that made the game less welcoming to women, or the causal exoticism of the other (such as descriptions of cannibals and savages in certain areas), or the gender-based maximum ability scores. Today, D&D (and 5e) incorporates a much wider range of influences while retaining a link to the past of the game. We continue to struggle with what aspects of D&D are necessary to maintain that continuity (to make it "D&D") and what aspects are necessary to throw into the dustbin of history.
Thanks for the post, and I agree with your comments generally. However, I think you are assuming that the above is consensus, that is, that everyone can agree that aspects of 70s dnd were products of their time and now outdated. Unfortunately I don't think there is a consensus that descriptions like "primitive" and "savage" carry with them colonial echos, for example, or that items that "curse" your character with a gender change make the game less inclusive. The discussions I've been a part of have often had to establish this ground, and I'm not sure that was successfully accomplished in the end (including in the GAZ 10 thread).
In this case the easiest sort of "evidence" to provide are quotes directly from the author, showing a certain amount of intentionality, leading to all the dynamics that you talk about in the OP. However, lost in this discussion are all the other elements of
context, including the historical circumstances that made the work of art possible and the intertextual influences, acknowledged or not. This is important when it comes to the development of tropes and genre; the 10 year old today can be interested in stories of warriors fighting dragons without being aware of the existence of Beowulf.
Compounding this difficulty is the assumption that the endpoint of these discussions is necessarily
offense and
moral judgement. I suppose this makes a certain intuitive sense: racism is bad, right? So if you are saying a text contains problematic racial tropes, then surely you are taking offense at said text? Surely you want it banned, just like we remove those statues of slave traders? Well again, not quite, because
context is important. Most of the time, I might just be making an observation or an argument, drawing a line connecting the text or image in front of me to a longer history. Bigotry is sometimes acute, but is more often pervasive; being able to notice and point that out is important, and per what I say above, not immediately obvious. So, do I think Kipling should be banned from literature anthologies? No. When I teach Kipling do I emphasize the context of empire, colonialism, and war in which poems like "The White Man's Burden" were written? Yes. (Should the British foreign secretary
recite Kipling while visiting a former British colony in the year 2017. No, you idiot.).