"As long as I give myself proper insulin for the carbs I don't have a problem with my BG being out of control after meals regardless of whether I have 200 carbs a meal or 60."
1. I'm going to postulate that this is true. That you have *good control* and do not have any difference in control no matter how big a meal you eat. (This is definitely not the case for me.)
Here's my take/understanding/not a doctor/I could be wrong:
Given (1) there is very little benefit other than the benefit that any person might derive. Type 1 is primarily the loss of an automatic mechanism that you must replace with a manual one. If you were theoretically able to maintain exactly the same glucose profile as the automatic mechanism, you would have no symptoms and be in the same boat as everyone else. The DCCT trial effectively established this. Having diabetes does not cause the complications. Diabetes causes loss of the automatic mechanism to regulate blood sugar. The resulting high blood sugar causes the complications.
However, even diabetics with "good control" can often have cumulative damage at some point that will affect them adversely. The degree of good control will essentially push that damage farther into the future. At this point, many of the things that affect other people (such as heart disease/etc...) are much more common in diabetics. So, the healthy things in life that reduce heart disease, etc..., will be that much more important for you (us). So, in this manner, even though your control was unaffected by your carb choice, it could be that a poor carb choice will still affect you disproportionately because of your diabetes.
Ultimately, you need to do what is right for you. If you are healthy and can maintain good A1c's with consistently low variance in daily blood sugar (not a lot of highs and lows that average out), don't sweat the low carb diet. The low carb diet can be a great tool for some of us. Same as insulin pumps. If it helps your control and you find it more convenient, fine. If you are doing great without it, more power to you. If someone is proselytizing low-carb, ignore it. But make sure you are honest to yourself about what good control is!
When I go on a low-carb diet, and it has amazingly great impact on my BG.
Here's one reason why:
My I:C is 1:5 and my ISF is 20.
Let's say i eat a 15 carb meal and my starting BG is 100. Even if I FORGET TO TAKE A SHOT, my after meal BG will be 160. The largest expected error to the high end is still within a postprandial range. Nice.