Mike,
I am not one of the extremely knowledgeable people yet but I see it this way. The people that do this for any length of time do it because they love it. People with a passion typically enjoy sharing what they do with others. If you've ever been to a knife event and met different knifemakers you will find out that in person they are super nice people. Yes, sharing hard won knowledge is counter intuitive. A few makers won't. And they are right too. But it serves the community when information is shared. But the information isn't really free. A price is paid to discover it and an unspoken responsibility is transferred with the information to pass it on. New makers who persist long enough to be experienced makers will make discoveries of their own along the way and share, and the debt will be paid. As has been said many times, we stand on the shoulders of giants. As you are finding out, knifemaking is a very deep rabbit hole. The "downside" of there being so much information available is that a lot of people (me) spend more time reading than doing. Just go start making knives and don't be afraid to make mistakes. Because all the information in the world doesn't help you if it stays in your head. It comes down to how you apply the knowledge and how good you are working with your hands. And that only comes with practice.