I suspect that most of us get a standard HB1AC yearly & little notice is taken of other BG testing. It stands to reason that unless we highlight any suspicions that it isn't correct, our doctors & diabetic nurses will give us a at on the back & tell us to carry on... and I say this as someone who's GP & DN are very good.
I think you've been lucky to land up with a very clued up & interested team which has led to your breakthrough. It does, however, reinforce what a lot of posters on this forum say about learning as much as you can about this condition and becoming your own expert.
Good news, though, as you should be on the right track now & it's onward & upward.