Medicine is not hidden. Doctors assume that the average person doesn’t know about their health condition and isn’t interested in knowing beyond the doctor’s opinion. And this is true most of the time. If you show that you’re knowledgeable or at least interested, your doctor will likely take more time to explain things to you. I do this often. My doctor once commented that I seem like someone who does a lot of research about my health. I said that yes, of course, it’s important for me to know about my health. My doctor takes the time to explain things to me, because I have a general idea what things are and what they mean, and also show interest in the details.
If you ask if something is good or bad, your doctor will obviously answer the question you’ve asked. If you ask for details, the doctor will likely give you more details. It is up to you to show interest, because most people are not interested, and doctors operate on that assumption.
There are literally hundreds of websites (mostly in English but not all, there are just as many in German) and discussions on Wikipedia in numerous languages about health-related topics, so there is really no reason to be an uninformed medical consumer, at least not anymore.
Before the advent of the internet, yes I could see this was a problem. But, not anymore.