In practice though, this is not the case. Our bodies are very complex. Stress, exercise, hormones or even your immune system fighting a virus will affect blood glucose. Highs and Lows are unavoidable. People often tell me that Adele's diabetes must be really bad since she gets her blood sugar tested many times per day (between 10 and 15+ times), but in reality this is what it takes to try to catch a low before it happens or correct a rising blood sugar before it gets too high.
No Type 1 diabetic is "worse" than another. Their pancreas doesn't produce any insulin.