I find it kinda odd that github.com/gorilla/websocket, which is deprecated and the repo is in archive mode, is still the most popular library for websockets.
My hunch would be that so much boilerplate already exists, and golang is so extremely popular, that a lot of it is being pulled into tutorials, samples and new projects. If it already exists there, I doubt the many users even check the repo.
I guess it's because gorilla/websocket has had a really big mindshare for a very long time.
and no project has had time to catch up and/or provide "reliable" hints that they will maintain that new project for a sizeable long time.
"the devil you know" and "the technical debt you know"...