This is optimizing for least study time (sometimes from zero knowledge) by studying to the test. If you're saying that studying applicable materials is quicker,

This is optimizing for least study time (sometimes from zero knowledge) by studying to the test. If you're saying that studying applicable materials is quicker, then this book is useless. Once you've "made it", you can explore things at a more leisurely pace (notably while gaining experience). I suspect the next thing to counter too much studying to the test will be to add an additional type of interview round (leetcode/system design/new thing) to the process, further extending it.