In fact, the first 2 years puts you in false sense of security.
We all know that DMII is a risk factor for CVD/CAD/atherosclerosis because of glucose toxicity right? So it stands to reason that aggressively treating DMII would reduce the number of complications and improve people's lives. If you said this to any of your pre-clinical professors, they would agree wholeheartedly with you. Glucose toxicity = more CAD/atherosclerosis. Period. Controlling sugars aggressively to be in the normal range (for non-diabetics) would be ideal, right?
Well if you did that, you would be killing patients because that's not what the real clinical evidence is saying.
Getting diabetics to a normal H1AC resulted in more complications and more deaths than a conservative treatment that kept diabetics' A1c's at a diabetic level. The lower your A1c (6.4% vs 7.5%), the worse the populations did.
http://www.nejm.org/doi/full/10.1056/NEJMoa0802743
If you are using only the first 2 years to guide patient care, you are doing your patients a disservice. The real world is paradoxical, it's non-intuitive and it works against what you can reason out.