[scottlocklin]

Even reducing the problem to one language you run into problems. All serious R developers have run into issues with CRAN (which is mostly centralized) causing problems with different version installs using install.package(). There are mechanisms for dealing with it, but the best solution is usually to maintain your own distribution of packages and a build script: further centralization. And R has a relatively good/simple package management system compared to something like pip, luarocks or Maven. Two which I never had problems with ... maybe because I didn't use them enough: leiningen and go get.