I can't agree. The people playing D&D back then were the same ones who were already into comics and fantasy cartoons and books and movies.The point is they werent as mainstream back and the separation of fantasy books, scifi book, comics, movies, and the rest was more solid. The ideas influencing D&D were fewer.
So you won't have people attempting to metalbend every trap. A DM or Book designer would have to sell players to play this game without the concepts from all these new sources.
We had all these concepts from all this other media already. Do you not think superheros were a thing in the 80s or something? All of these heroes and villains in the MCU now all came from the 60s-80s. All of them. With all of their powers.
There aren't any fantastical concepts that are out now that didnt also exist back then.