I really feel that's a failing of rpm and dpkg. You should be able to install new packages for your local user without sudo and without affecting other packages

I really feel that's a failing of rpm and dpkg. You should be able to install new packages for your local user without sudo and without affecting other packages. If the system tools weren't so lacking, I doubt we'd have the proliferation of language-specific packaging systems. If they were better designed, you could simply tell debian users to install rpm to handle their rust packages, like you now tell them to install cargo. That sounds ridiculous, but it shouldn't. I'm hoping Nix, Guix or something of that sort can one day fill that role. Integrate them nicely into distros and let them slowly take over the non-system packages. Let rpm and dpkg slowly wither away until finally, with a little "pop", they disappear into nothingness. Of course, all these language-specific package managers support Windows, so I hope Nix and/or Guix actually do so. As git has shown, it doesn't even have to be amazing support. But, without something basic, people are going to keep inventing new package managers to make Windows work. Will you kill off all other package managers? Obviously not, but I do think you could prevent quite a few people from re-inventing the wheel for their next language if there was already a good tool to build upon.