Of course they do. It gives them authority.
I don't follow those who are self-proclaimed authority.
Tradition is not reliable enough to be authoritative. God saw fit to put what He knew we needed in a book. He's a big fan of writing things down. that way there's a permanent record of it and it can be used as a standard to verify it instead of assuming or counting on men having enough integrity to NOT corrupt what if being passed on by word of mouth. Because THAT certainly isn't going to work.
Then why do you use Luther’s list of books if tradition is unreliable?
Malachi 3:16-17 "Then they that feared the LORD spake often one to another: and the LORD hearkened, and heard it, and a book of remembrance was written before him for them that feared the LORD, and that thought upon his name.And they shall be mine, saith the LORD of hosts, in that day when I make up my jewels; and I will spare them, as a man spareth his own son that serveth him."