I agree, the `dev` extra group should be used for development dependencies. The arguments against it are pretty weak, especially the "i don't want dev dependencies listed as dependencies of the package on pip" line; imo if a package is required to interact with the dev environment it is a de facto dependency regardless of whether it gets installed in a normal installation.
Strongly agree. Plus all the benefits of automated tools like dependabot. Wonder what it would take to get poetry, pdm, and rye to change their behavior.