Debian votes on init systems

If including the musl patch imposes any additional maintenance burden on the packager, then while musl isn't an official Debian port there's no absolute expectation that the maintainer would accept it - policy certainly doesn't require that they do. I'd expect many to be happy to carry small patches to make this easier, but it's not an obligation. For packages that actually rely on functionality that's in glibc but not elsewhere, things become more complicated. And, outside the current policy obligations, it's the same for non-systemd init support - in most cases there's a relatively small overhead caused by looking after it, but in other cases it's much more significant. Creating an expectation that core system components should be entirely replaceable is creating an expectation that package maintainers will take on additional work without benefiting the overwhelming majority of users.