This is an overly-dire assessment in my opinion. Setuptools + Pip has been more or less stable for years, and no changes in dev environment have been needed since stability was reached. There is a lot of new stuff coming out, for people who want new stuff, but there's nothing wrong with the old stuff if the old stuff works for you, which will remain supported for several more years if not forever.

I think poetry actually does solve it

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.