I agree with this but your numbers are off IMO. Diabetics who use closed loop systems diligently can achieve A1Cs nearer to 5 without becoming dangerously low all the time. It is hard, but new tech is making it easier. Also an A1C of 5.5 is at the very top of the acceptable range before being pre-diabetic (5.7). Lastly, your nervous system becomes accustomed to the blood glucose range that you are frequently in... there are studies about T2Ds with A1Cs of like 9 who get low blood sugar symptoms when their glucose is ~90mg/dl (normal). So A1C of 5.5 in T1D does not automatically imply dangerous hypos all the time, maybe A1C of 4.9 does though.