I don't know if this was already debated but I don't know how to search in the whole archive of the list.
For now the adoption of pyproject.toml file is more difficult because toml is not in the standard library.
Each tool which wants to use pyproject.toml has to add a toml lib as a conditional or hard dependency.
Since toml is now the standard configuration file format, it's strange the python does not support it in the stdlib lije it would have been strange to not have the configparser module.
I know it's complicated to add more and more thing to the stdlib but I really think it is necessary for python packaging being more consistent.
Maybe we could thought to a readonly lib to limit the added code.
If it's conceivable, I'd be happy to help in it.
Nice Day guys and girls.