I don't think designers assume everybody is a master knitter, there is no reason that they should write patterns/books aimed solely at beginners. There are many books aimed at beginners containing everything you need to know. If they prefer to write patterns at an advanced level that's just the way it is. I know I don't love the most simple/basic type patterns, if I were a designer I wouldn't enjoy writing/designing that type of pattern either. I think they have simply chosen to make a book aimed at non-beginners.
I was looking at knitting books a couple of hours ago and didn't buy any specifically because they were so basic/for beginners and had no patterns that appealed.
The fact that it's not an easy/beginner's book, or doesn't provide stitch-by-stitch instructions as you were hoping, doesn't mean it's flawed. If it had given the impression via marketing that it contained easy/step-by-step patterns etc. for beginners but didn't, that would be a mark against it in my opinion.
No offence - I don't mean to sound cruel - but if you order a (non-pattern) book without knowing what's in it, and it arrives but isn't what you were hoping for (including patterns), that's not the fault of the authors/publishers, nor is it a reason to be disappointed in the book itself.
Instead of assuming everyone's a master knitter, maybe they just assume that people who don't have the relevant abilities to complete the pattern won't buy it - from the sounds of it, this EZ woman is all about helping the knitter become capable of making complex decisions themselves. I think this is even more important now that we have the internet to answer any question we might have quickly and easily and we don't need a knitting dictionary/encyclopaedia on our bookshelf, that's what Google's for!
But thank you for posting about the book so anyone in future who thinks about buying it expecting it to contain patterns will be able to find out what it is