Some want to delve and understand (for many good reasons) the internals of how Perl implements the hash.
As users (for me, too many interests besides the above), some want to know whether the ordering of the hash is consistent.
As a user, I would say that I can imagine that the hash order would be the same for the same data and all other things being equal, but I would never try to depend on that ordering. After all, I'm looking up by key, not in order.. a nice foreach works well (I can always sort the keys if I need to).