For filesystems, it's a tough call. They are one of the most, if not the most, important parts of the system with respect to requiring absolute reliability. B

For filesystems, it's a tough call. They are one of the most, if not the most, important parts of the system with respect to requiring absolute reliability. Being stable isn't necessarily a bad thing. In the case of OpenZFS, where it's implemented by multiple operating systems with differing requirements, maybe the different priorities and goals of the different teams will result in cross-pollination of ideas and implementation details rather than it stagnating top-down. I.e. there's scope for some differences in features and details, while still adhering to the common design.