Actually, the WTS focuses on a very few "proof" texts. They touch on an infinitesimally small number of passages, and then never in depth. Usually the WTS writes a paragraph of its own ideas and then it pokes a verse reference at the end. More often than not, the reference is irrelevant. With this process, rather than providing a contextual exegesis, they start with a conclusion and then "provide" a support.
I have several books that do discuss every verse of Scripture, with each book providing hundreds of pages of indepth discussion and exposition.
The WTS books have a very narrow focus and they cover only very few subjects -- just those that are misinterpreted to keep the ruling autocrats in power.
Doug