Except for a few points, I do not think we have a major disagreement. Quoting from my article: "One advantage of the nasal cannula over a mask is that it allows the patient to cough, eat, and talk without removal of the cannula." This is essentially the same statement you made in your letter. Thus, I do not think we disagree on this matter. However, just because both you and I prefer a nasal cannula does not mean that the rest of the world should. The important point is that "controlled oxygen" should be used either by nasal cannula or a Venturi mask. Either is medically acceptable. Most institutions give the physician an option to use either a nasal cannula or a Venturi mask, and, thus, I disagree with your statement that few persons make use of the Venturi mask at this time.
Also, we do not differ on the