They say that “Knowledge is Power”, but nowadays anyone can look up knowledge anytime anywhere on their phones.
Knowledge is now cheap.
Many of the developers I have worked with no longer take the time to remember the syntax, they just look it up when they need it.
The real power is in how knowledge fits together with other knowledge. Understanding the connections and how knowledge affects other knowledge is where there is value.
This is easy to see in the domain of stocks. Having the knowledge of the historical prices of a stock and having the knowledge of different trends is information readily available. Understanding how the trend affects the stock price is valuable and can possibly allow you to make a significant return on a stock.
It is becoming more and more important for people to be able to have understandings of multiple domains and how the domain interact with each other.