There's no talk of completion. This isn't a "diet", it's a diet. We aren't using it as some colloquial meaning for losing weight, etc. This is about a lifelong dietary change to address excessive carbohydrate intake.
If it doesn't have "any effect" then I guess all type 1 diabetics are already dead?
The point still stands - doctors should be counseling diabetics on dietary changes, even if they are being prescribed medication. Some patients can improve their condition and overall health to the point that they can stop the medication. If you disagree with this, please, show me some sources. As for mine, you can check the AMA, AHA, ADA, and PubMed (American Medical/Heart/Diabetes Associations).
That's very much _not_ the same thing as a doctor recommending or prescribing them having any effect.