Oh, there are a half dozen different tools that solve python package management. Unfortunately, they are mutually incompatible and none solve it for all use cases.

It’s somewhat the opposite situation, poetry is a tool that lots of people are adopting rather than one being pushed by a standards committee. I don’t think it set out to unify a dozen standards, only build a good UX and to be reproducible.

Poetry isn't an additional standard, more like an implementation. It is PEP 518 compliant.