I was told that 40 plus years ago, not a new argument. If you are worried about it use a muzzle guide/protector. I know I have articles in some old books on it, but not worth looking for as most folks already have their minds made up.Hard to believe, so waiting with eager anticipation for your reference.
Think about sandpaper and steel. Which is harder, the soft paper backing holding the abrasive or the steel?