There are other factors involved. Not that books aren't essential, but the dynamic is different; it's harder to find information, and a 20-year-old book will address a topic in the way the world was back then. The world is constantly changing, and certain types of information need to be updated. Of course, not everything on the internet is viable, but even books could be found there. The big question is how the current generation deals with so much accessibility but, at the same time, so many distractions from what's truly essential.
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Yes there is multiple factors involved. One of those factors is politics. You might just find more information from a book that is 50 years old because it was more acceptable to talk about back then but the topic is controversial now. Which leads to information being hidden that might be useful. I struggle to find information on my Blood type. There may be multiple reasons why I can't find it (genetic selection, eugenics, WW2, lack of information, medical practices that haven't been caught up with knowledge, regulation, etc.).
Here is an example in the book Human Heredity and Birth Defects by E. Peter Volpe Published 1971 First Edition
On page 132-133 You can find
I agree information needs to be updated. Not every book can be found online freely, that is why a library is still needed to this day. Do you want to pay for a PDF just to read an article out of it? I sure don't. But here's the link to the book regardless Human Hereditary and Birth Defects
At the time of my son's birth I had a false period. I didn't know I was pregnant until I was 2 1/2 - 3 month and by that time, I may not have been able to get the RhoGAM shot because I was already producing antibodies just not enough to kill my child. They only test you when you are pregnant or giving blood. They don't tell you when you are born, if they did I may have made better choices and took less risks. There was no regulation in place for giving the RhoGAM shot when my child was born and it's not required for them to inform you of your blood type. Too this day if you want to know your blood type you have to donate blood. Alberta Prenatal Screening Program for Selected Communicable Diseases page 9
I didn't know my blood type until I had my second pregnancy and that meant nothing to me at the time. I only knew about the incompatibly to blood transfusions. I didn't know I was high risk and that my bloods antibodies could harm the child inside me until 15 years later when I came across a YouTube video explaining why I couldn't carry a child to term. To this day no doctor has talked to me about my blood type. This statement could be the reason why.
But it's not 100% accurate because genetics are not cut and dry, they very complex and can have a different outcome depending if the are dominant or recessive genes and most of all how many people in the area have that gene.
How is it that the O blood type is a recessive gene and yet it is the most common blood type?
Why I bring this up is because when when I look up my blood type I have a had time finding anything about how my blood type effects my body. And they can't make up there mind if I have a better or worse health outcome. There is not a lot of studies on my blood type or they are hidden. That book helped me in asking the right questions to find information that I would not otherwise. My family has Marfan's Syndrome and all I can find for connection to my blood type is A suggestion of linkage between the Marfan syndrome and the rhesus blood group and that the collagen diseases such as Marfan syndrome can cause abdominal aortic aneurysms but because I am type A Rh-negative blood group I have a decreased incidence of abdominal aortic aneurysms. It took me a long time to find this article Abdominal Aortic Aneurysms There is so little know about my genetics that I cannot go to General Practitioner to get tests done because they have no clue what tests need to be done and a specialist is hard to find.