I don’t think there are any plans to changing it at this point since the tools have taken to the last change to allow them to store settings in the file. Plus pip has been relying on PEP 518 for over 2 years.
Plus I’m tried of people pointing out PEP 518 is provisional like we are somehow going to change
pyproject.toml in a way that goes against what is in the PEP.
I guess it’s the call for @ncoghlan as BDFL-delegate if we can lock this PEP down.