Well, OK, Sorry Mr. Yang.
Here's what prompted me to agree with Robert's comment.
I bought Yang's Fundamental Principles of Go about a year ago, when I was about 8k. I was very eager at the time to find out what in fact the fundamental principles of go were. Well, frankly, I was disappointed that there were only 5 chapters.
The first one ranks opening moves, and the principles seemed hardly earth-shattering. The second, Relationships and Combinations seems to say that one should efficiently sprinkle one's stones about the board - some high, some low. As you perhaps suspect, part of my problem with the book is that I don't understand anything about go.
The third chapter - Effective use of Joseki - helps one pick the right approach moves and pincers. On re-reading, now that I know more than 3 josekis, (Yang suggests that an amateur need know only some 300 fundamental variations), I am starting to see that the principles this chapter presents are indeed fundamental.
The principles entailed in Chapter 4, on Invasions and Reductions, didn't sink in. This is probably because my reading is too poor to put the principles into effect.
The last chapter details invasions of 10 specific formations. This chapter seems less about fundamental principles and more about specific sequences. Again, this probably reflects my lack of understanding.
In any case, it seemed to me that a book with the title Fundamental Principles of Go should have more chapters and cover more subjects, such as: principles of attack and defense, principles of cross-cut fights, principles of sacrificing stones, principles of timing, principles of counting, principles of ko - just to mention a few. I guess that all that would fill up at least another book, but now that I've apologized, maybe Mr. Yang will consider writing the sequel.

Patience, grasshopper.