We don't, but it is the easiest way to ensure the package manager is adapted to the language and the library ecosystem. It is also easier to add features, remo

We don't, but it is the easiest way to ensure the package manager is adapted to the language and the library ecosystem. It is also easier to add features, remove misfeatures, and fix bugs when the package manager only has to handle a single language. Once we understand package management better -- we don't understand it well yet -- it will likely be feasible to consolidate many package managers into a few omnimanagers.