What that book does for me is give me the tools in the same way that I had the tools when I learned the regular scales or the alphabet. If you give me the tools, the syntax, and the grammar, it still doesn't tell me how to write Ulysses.
The fact that a player is very short of time is, to my mind, as little to be considered an excuse as, for instance, the statement of the law-breaker that he was drunk at the time he committed the crime.