I am considering introducing my organization to Poetry for Python, and I came across this claim:

Avoid using the Poetry tool for new projects. Poetry uses non-standard implementations of key features. For example, it does not use the standard format in pyproject.toml files, which may cause compatibility issues with other tools.

–Modern Good Practices for Python Development

Is this true? I didn’t immediately turn up anything searching. What does Poetry do that is nonstandard, in the pyproject.toml or anywhere else?