> "Linux will ignore the best implementation of a thing because we/they don't like the license."

> That's a choice, not a law of the universe. It's perhaps also a canonical example of spite-induced nose cutting

It isn't because they don't like the license. The licenses of linux and zfs are incompatible, so zfs is out of tree and that leads to technical problems. No, it isn't a law of the universe, but it is the law of the United States at least, and probably many other countries as well.