I 100% agree on this. But it's been pretty hilarious on how obstinate tool makers are about changing to Python's new pyproject.toml [1]
Python packaging is a bit of a mess already, so when I recently started a new small package I wanted to choose tooling that would not clutter, but a fair amount of tool makers were reluctant to allow code into their repo that would use the unified toml rather than a ton of separate file.
.config is probably a better solution than a single top level toml, IMHO, but far more important is doing something unified rather than continuing the pollution of the top-level namespace, which merely obscures the project structure.
Python is unified on a requirements.txt file with pip, to manage dependencies.
requirements.txt has a lot of deficiencies for package management (compare to the various features Yarn or Cargo offer). The biggest weakness is transitive dependency locking: even if you specify the exact version of the dependencies you want, Pip can still resolve to a different version of their dependencies, and even then there’s no verification that the content matches what is expected beyond the version number (other tools use a content checksum). This can cause a long tail of reproducibility and maintenance issues.
It’s also a tiny subset of what the parent describes.