Distros generally do try to do this, but it doesn't matter much in practice, not enough users go to the distro by default (in part because the distro maintainer

Distros generally do try to do this, but it doesn't matter much in practice, not enough users go to the distro by default (in part because the distro maintainers, quite understandably, can't actually solve most of the problems, even the ones they caused). So a distro that releases a broken package inevitably causes a support burden for upstream. (I personally agree that debian's "let's just relax version dependencies on rust projects and hope that it works" policy is insane: a recipe for all kinds of subtle breakage that no-one working upstream is even trying to avoid. And this kind of fiddling is not unique to rust, either, nor is bcachefs the first project to say "don't use debian's packages")