It is amazing to me how many language landing pages are largely devoted to install guides rather than explaining the language's raison d'etre.
The current landing page lists features [1], and if my memory serves me the original landing page 15-ish years ago did not primary focus on an install guide. I can't check right now, since Wayback Machine is still down.
What also could happen with repository readmes is, that the sections devoted for explaining the language moves to github pages or a landing pages hosted somewhere, and the sections with install guides stay in the readme, as they are useful for people who want to contribute to the github repo.