Ask HN: Why wasn't Vagrant widely adopted by open source projects?

With GitHub Codespaces gaining in popularity, I was wondering why the problem of having to setup a whole open dev environment for submitting a tiny fix to an open source project was still the hassle it is. We have software like Vagrant, Docker, etc. which are supposed to take care of exactly this, yet relatively few open source projects provide a file. Why did adding a Vagrantfile not become as natural as adding a README?