Scientifically, a single study means basically nothing except that further follow-up studies should be done. It should be noted that the DCCT was not the first study done on blood sugar control and complications; it was the big follow-up study done in response to earlier research to confirm whether diabetes control had any impact on the development of complications.
But all that aside: today most patients with T1D are already achieving the goals that, acording to you, reduce mortality. According to T1D Exchange data, more than 70% of the 26,000+ patients in their database have an A1c between 7.0% and 10.0%. That’s far greater than the 14% of patients who have an A1c of 6.9% or lower. So changing guidelines would not change much in reality. And, ultimately, guidelines are just guidelines. Patients have a legal right to choose their own treatment as long as they are aware of the medical consequences and are able to cognitively make such a decision. Even a patient with terminal cancer can choose not to have chemotherapy.
And I do wonder, since you seem to feel so strongly about this issue (and have posted many similar posts about the negative impacts of tight control), why do you maintain such an extremely low A1c yourself? I’ll admit, this baffles me. If you believe tight control is so harmful, why not loosen control? Like any medical treatment, your level of control is ultimately up to you. And, while you continually describe medical professionals forcing, tormenting, and punishing people with diabetes, I really can’t picture any doctor “forcing” you to have such a low A1c. Even with current guidelines, most doctors would be perfectly happy with an A1c of 7%.