Will medicine always keep blood sugar down?

I’m concerned about my husband because he is a Type 2 diabetic and eats sweets every day. He says he can do this because the med he takes, Metformin, keeps his sugar down. It’s usually 6.3 every time he gets his a1c tested and his doctor said this is good to stay below 7. A neighbor of mine is also Type 2 and said she feels Type 1 is much more serious and that Type 2 is “exaggerated” all for money. She doesn’t bother to check her sugar every day and neither does my husband. They don’t feel it’s necessary and say they feel fine. They only get it checked every 3 months from their doctor. My neighbor said she will not waste money on a monitor because it’s all about money and that she soaks her feet at least once a week. Diabetics are not suppose to soak their feet but she laughed and said her foot doctor told her it was fine. I read the only reason they shouldn’t soak their feet is because the water may be too hot and they wouldn’t know it if they have numb feet from diabetes and could get burns. Then why not just test the water first with your hand? My husband also laughs about having to see a doctor about sores on his feet. He said “I have two eyes in my head and can see if there are any sores and I have none”. Well he’s right. I checked his feet everywhere and there are no sores so why waste time seeing a foot doctor? My neighbor said she is convinced that Type 2 diabetes is exaggerated and that her medicine always keeps her sugar down and that she will continue to enjoy sweets. My husband feels the same. I guess some people can just take the meds they need and they can still eat sugar? I know diabetics can have sweets sometimes, but my husband and neighbor have them every day. They’ve been seeing a doctor for years and their blood sugar is down enough according to their doctors. So for all you guys who are diabetic, what has been your experience? Does medicine for diabetics work that well for Type 2 people? So well that you can have sugar every day? Thanks for your opinions.