There are several problems that principles of instrumental transmission need to avoid.  First, means to an end can be costly, or otherwise objectionable.  Suppose that I ought to take a job in Alaska.  One (sufficient) means is to fly there; another (sufficient) means is to take free passage on a merchant ship. But flying costs more than I would earn there.  Presumably, I ought not fly.  It may be said that I have some reason to fly, but that it is outweighed.  This is an argument against Ought Sufficiency.  