Do you see the fast development itself as a problem? I tend to see as the real issue that most package managers only allow one version of a package to be instal

Do you see the fast development itself as a problem? I tend to see as the real issue that most package managers only allow one version of a package to be installed, leading to conflicts very quickly. The best known manager that does allow this is Nix, do you know of any more, maybe ways to get this working with "traditional" package managers (completely transitioning to Nix is would be quite hard, from my limited experience)?