Is the fact that there are multiple package managers for the same package fornat/spec the reason why people say it's a mess? Genuine question: How is PyPI diff

Is the fact that there are multiple package managers for the same package fornat/spec the reason why people say it's a mess? Genuine question: How is PyPI different from NPM, Maven, crates.io, etc..? Why "Python packaging is a mess" and not the others?