The liability thing is another Red Herring. Almost every other airline had their own FAA approved manuals that were far better than the factory, which is more a minimum standard.

There is no excuse in our world for lack of standardization - I don't buy the liability, we might be checked on it nonsense - now we are checked to two standards - the schoolhouse and the way we "really" do it.

I hear the liability excuse all the time - I think it's just a weak excuse for sloppy airmanship