My experience w/ doctors is, they know what they learned in medical school, and they know whatever they’ve gleaned from their years of practice treating patients in their office based on what they learned in medical school, and hopefully whatever continuing education they get, and for most well-known and understood medical problems, this is great and all that is needed.
T1D is a totally different ballgame. It’s daily self-management. There is so much nuance and the whole slew of factors that determine what you need to do at each part of the day with respect to insulin, eating, resting, and exercise (not to mention other stuff like illness, stress, etc.), that there is just no way even an otherwise good endo is going to know how you need to deal with all of that. No one can, actually, but you. An endo with Type 1 is probably the only exception.
With regard to new technology, new techniques for managing T1D, new studies and knowledge-bases, I don’t think I’m being cynical in saying that most doctors, like most people (after all that’s all they are, just like us), are not going to be motivated to go above and beyond what is already required for meeting acceptable standards for their job. So, generally, they are not on top of all this new stuff (tech, better understanding of how to manage (e.g. pre-bolusing for more than 10 minutes), etc.).
My take is, and this is how I deal with this myself (and I’m only 7 months into my own T1D, btw), is to check in w/ the endo when they say they want you to, rely on them for prescriptions and getting and interpreting bloodwork, and otherwise be your own medical care professional - do your own research, experimenting (within safe and reasonable boundaries obviously), and glean as much understanding of your disease from your own experience. I’ve repeated a lot of what others have already said, e.g., be your own advocate. Tell, rather than ask, your endo that you’d like to try a new tech device, and then realize you’ll probably have to do all the learning about how to use it mostly on your own. But that way you’ll learn so much better, anyway.
Anyway that’s just my two cents!