Please correct me if I'm wrong, but wouldn't reproducible builds eventually cut down on the work of package maintainers for Linux distros? Looking from my outside perspective, once you get the packages building reproducibly the work to maintain them is reduced (especially if you can pass the responsibility for packaging to the developer). Couple that with a build-time test suite and the work becomes even less of a burden.

I hope this is the case, as I believe that one thing that holds Linux/BSD back from further refinement is the workload involved to maintain packages.