Then we do agree on this point, that other than the virgin birth of Jesus, Lutherans are very quiet on what Luther wrote about Mary.
Because nobody cares, personal opinion. Do you have a study on the Pope's favorite color? (Red btw) Lutherans care what the Bible says about Mary.
The Book that Rome assembled is very 'quiet' about the things Mary said during her lifetime.
But Rome; in it's infallible wisdom; has detected; in the penumbra of Scripture; many things that Mary 'really' meant to say, but never got around to speaking.