Point. Matrix, have you never read a shitty Teach Yourself LANGUAGE book?
Correct.
So you're saying you've never read a shitty language-teaching book? Seriously? I find that very hard to believe.
To be fair, we know that most language-teaching books are shitty, and if you've never read a good one you may just be consigned to believe that that's just the way language-teaching books are.