Does specific authorship of a given book of the Bible "matter"? Based on a variety of previous questions, it seems that specific authorship of many parts of the Bible are not known for sure.
For example (though I realize there are traditions of who wrote what):

Job
Ruth
Esther
Hebrews

Question(s):
Why is specific authorship considered important (eg the on-going scholarly debates over who wrote the epistle to the Hebrews)?
Is it important?
When is it important?

note - I am not looking for direct answers to canonicity, but for whether specific authorship is important
Author means the person who wrote a book, put pen to paper and signed his name to the work. As far as books of the original "bible:" what has been found are only copies of books. Some have been signed by the copier - a few early copies have been dated - and we can discover something about who authorized the copy. But as we have found no original writings, we cannot know who might have been the originator of the text we do have. Since we cannot know who was the author, this topic is not important.

But if you want to know who wrote the translations of the Bible as we have them in our various Bibles, that's another topic, and worth discussing.