I feel that this is not really the case, as far as I know LibreWolf only has a handful of contributors. I also don’t really feel it’s been demonstrated that Arkenfox is significantly worse to use.
macOS? And on Windows I don’t think the existence of third-party package managers like Chocolatey excuse actual automatic update functionality.
Have they though? The main reason (other than automatic updates which is perhaps still an even bigger issue) Librewolf was rejected is: