The problem with language package management systems is they've been used for installing user facing software. As a developer tool I think it is the perfect way

The problem with language package management systems is they've been used for installing user facing software. As a developer tool I think it is the perfect way to go. And you should add Linux to your Windows/OSX as being an issue, which Linux package management tool would you build packages for? All of them? The end user package management provided by the OS should be for installing end user packages and the language tool for installing and publishing libraries and dev tools.