> every discipline has it's most fundamental books ... e.g. philosophy -> Socrates, Plato, Aristotle, civil law -> code civil, christianity -> bible, etc. one should read to get a truly deep understanding.

I dispute this idea. For some disciplines, this may be so. For other, such as physics, biology, chemistry, mathematics, civil engineering, poetry...actually, for most disciplines they aren't based on fundamental books. They're based on a living community of practice.

In these disciplines a book is important only insofar as it can be used to increase your abilities. No one goes and studies the textual details of Landau & Lifshitz as a guide to anything, any more than they do so with TAOCP.

Rather than worry about fundamental books, worry about opening up black boxes at a steady rate.