I've definitely found this. I've learned to assume that unless a doctor/nurse/dietician actually specializes in diabetes, then I need to take anything they say about it with a grain of salt. My OB, for example, told me that I should be eating things like peanut butter when I have a low blood sugar, "Not candy!" Ummm. Really?
So I rely on my endocrinologist only at this point. If I needed to find someone new to help with my diabetes, I'd find another endocrinologist or someone recommended to me by another type 1 diabetic.
I have been T1 for 27 years and I have had good and bad. My dad is a GP. He has apologized to me for sending me for a painful test, after he himself had it a few years later.
Once I had a Endo that mostly treated T2. He told me that the pump was a reward for diabetics who were under control. I had a yelling and crying match with him and found a new endo. I found a new endo and had my pump 1 month later. I have never had better control.
I have found that this is a crap shoot. A doctor is only as good as what he treats. Everything is in theory until then. When I was sent the survey about inviting non diabetic professionals- I was not thrilled, because it is easy to give advice and directions when you have never done it.
I am a type 1 close to 60 who has had diabetes since I was 7. Over the years I have had experiences with several specialists who have really shown their lack of knowledge. One was a dermatologist who suggested that maybe if I lost 20 pounds I would't have to take insulin (he thought the insulin was causing my rash). He didn't have a clue about type 1, My internist but things in perspective by reminding me that this particular doctor's specialty was dermatology and he probably hadn't heard about diabetes subce medical school. And then there's docs who think they know everything. Example, I told my rheumatologist on the first visit that both my internist and my neuphrologist said absolutely no steriods. He didn't like that and told me he was an internist too and thought I should have steroid shots. When I asked him why, his answer was, "Because I said so." Not the way to continue to be a part of my medical team. I really appreciated it when my new CDE (a type 1 married to the endo, who is also type 1) told me that I was something new for both her and her husband--they had never treated anyone who'd been diabetic as long as I had and we'd have to try things together. Bottom line: I pick my medical team carefully and, when the doc agrees, have a sit-down before making an actual appointment to assess whether we will be a "good fit." Yes, sometimes you have to pay for that, but it's well worth it to me.