Yes. As long as I know I think one cant expect a complete book with the title, Why Evolution is True to contain the convincing proof for the theory of evolution. It is very disappointing. What they really have is a whole lot of excuses to fill the GAP.
The more you read biology, the more this goes into crisis as one has not yet proved anything how the first living molecule emerged from the dead matter.
There are important gaps you guys need to fill in species as well before thinking about dead matter to species.
Though majority of scientists have accepted it as true but still not convincing as its kinda same like Newtonian physics which was unshakable until Einstein disproved it.