Yes that is one key that resonated with me. The author did a great job of putting these recurring concepts into their own words

The other that really resonated was something that I read before along the lines of… we think that once humanity learns something, that knowledge stays and we build on it. But it’s not true, knowledge is lost all the time. We need to actively work to keep knowledge alive

That’s why libraries and the internet archive are so important. Wikipedia, too