Newbs believe complexity equals intelligence which equals more profits. Reality is complexity equals wasted time, wasted money on complex hardware, software, profits. Sometimes KISS is the hardest thing to do. People who KISS look stupid, dumb, boring.
It's a simple task, which way is the market going ?? and how do you join that with more upside potential to downside, over complicating it, is why we mostly screw up.
Obviously professional traders wouldn't write such books. Many professional talkers/writers failed to spend thousands and thousands of hours looking at charts. Many people are fooled into thinking such books are very famous/popular and hence they follow such books like gospel truth.