Link on how to make generic trash:
Diversity means everyone is the same but they look different:
"Player characters, regardless of race, typically fall into the same ranges of height and weight that humans have in our world."
New character races don’t have the Ability Score Increase trait that Player’s Handbook races have. The new races instead rely on a special character-creation rule that allows a character to increase one ability score by 2 and another score by 1 or to increase three different ability scores by 1.
Generic Humanoids bear the words “Any Alignment,” reminding the DM that such people have vast moral range.
That one word—“typically”—reminds the DM that the alignment is a narrative suggestion; it isn’t an existential absolute.
Before anyone mentions Gary Gygax and his legacy, the guy was a leftist. I was reading yesterday the preface from the AD&D player handbook (the part I never normally read) and this caught my eye:
I think it shouldn't be forgotten that part of his legacy was that rulings from the DM overrule any and all written rules. What this means is that everything written in the rulebook doesn't mean shit, you do what works best for your group. Subtext that people who play RAW (rules as written) are subhuman.
Regardless, I don't think it's bad to disconnect the person from the accomplishment. Dnd itself really isn't that important outside of being a stepping stone for the growth of gaming.
To address your OP:
I never read any of Gygax's direct lore/worldbuilding stuff, but even the books I read from 3/3.5e maintained that evil monsters were evil for cultural reasons. You can't expect a rational culture to develop from a monster with inhuman abilities like trolls or expect palatable morality from the slave-like kobolds. So I keep hearing about these ridiculous changes to modern dnd and being blown away by the worldbuilding implications and fanatic naivete it all reveals.
I like this part, they're creeping towards some dangerous wrongthink here. But it's same old same old for nu-dnd, we could highlight and banter about quotes from this article for hours.