There's a lot of over explanantion, white space, repetition and just plain bloat.
I think you are undervaluing white space. The human system of perception does not at all deal well with huge, dense blocks of text. White space can be crucial to making a book usable.
As for the explanation and repetition - while you are correct that it could be removed, removing it may not exactly help the users - sure, it's complete and short, but some folks may be left not understanding what they're supposed to be doing.
"Just plain bloat" is not well-defined, so we can't really address it.
Overall, there remains a major question (that should often be asked of mad scientists) - whether or not you can do it, should you do it? It makes the book smaller, sure. And maybe you personally don't need the extra stuff that would need to be expunged. But maybe they are good for the broader market.
And, really, what is gained by making the book smaller, other than less back strain from lugging them around?