GitHub's editor is useful for simple fixes, (formatting, markdown, typos,) but Codespaces seems extremely useful in building a reproducible dev environment for more complex packages / projects, including build tooling!
If you could have a fully-functional dev environment with pre-installed dependencies in 10s and the package takes 48 seconds to build and test, then you could.
I'm aware of several places in my team's codebase where you can change a couple of characters and break the entire company if you didn't test the change.
