Call me old-fashioned, but I also hold out hope that at least some of those questionable implementations could be fixed if only someone with the desire would write a patch and send it upstream. Bringing systemd to musl means the people in musl land that aren't knee-jerk anti-systemd maybe might be more enthused to do just that, improving it for everyone using it.
And it has some questionable ideas with good implementations. For example, I hate the journal, but admit it is implemented well.
At the end of the day, it's about tradeoffs and using what suits the system at hand. For some people that will be systemd, and bringing systemd to Adélie and other musl libc distributions means that it can be used by those people.
Call me old-fashioned, but I also hold out hope that at least some of those questionable implementations could be fixed if only someone with the desire would write a patch and send it upstream. Bringing systemd to musl means the people in musl land that aren't knee-jerk anti-systemd maybe might be more enthused to do just that, improving it for everyone using it.