That's a major wayD&D changed.There is a difference between rare in the world and rare in the story. Jedi are rare in the SW galaxy but ever present in the stories we see.
In the beginning the 70sand 80s, the world and the storywas humanocentric. Elves and Dwarfs were on decline.
Around the 90s, fantasy was still humanocentric in setting but the parties and heroic/villainous groups were full of demihumans.
In 00s, settings stopped being centered around humans.
in 10s, the heroes might only have 1 human member.
In 20s, the humans might be the little guys and bit players.