Which moves do you disagree with? Where's your proof that they're wrong?
If you would consistently, regardless of circumstance, play the weaker hand in a "coin toss" in Hold 'Em, you will lose more often than you will win. It's that simple.
Did I say regardless of circumstance?
I said "not necessarily' as in sometimes it is a bad move and sometimes it is not.
The distinction is not necessarily hindsight based on the result.
Sometimes one can easily afford to take more chances and play more aggressively and sometimes one shouldn't.
Sometimes the person with the worse hand should take a chance and sometimes the person with the better hand shouldn't take the chance.
I would never split 8,8 against a A or 10.
I would never split 6,6 against a 2 or 3.
There are several situations where I will play one way or another depending on how the play has been going and the feel I have for the table and shoe.
Like hitting a 12 against a 2 or 3. Book says hit but I will sometimes stay.
Like hitting 13 against a 2. Book says stay but I will sometimes hit.
Book says to double on A,6 against a 3.
I might do this if I am up and playing with profits but I won't start out doing this or if I am down.
Same goes for splitting 2,2 or 3,3 against a 2 or 3.
These are more aggressive risky plays that are not always appropriate.
There are several borderline calls that can go either way for any given hand from any given shoe on any given day.
Just because a slight mathematical edge would be realized over several millions of possible hands doesn't mean that the side with the slight edge is always right and the other is always wrong.
The tiny sampling of any individual's play is nothing and statistically irrelevant and you can lose your shirt waiting for the odds to turn to the way the book says it should be.
Being lucky and finding a good seat with a low minimum and a large range to the maximum is important.
You have to have the option of easily moving to another of several tables with various numbers of players.
When every table is full with the odd open seat here or there and high minimums relative to your stack, your odds go down dramatically whether playing by the book or not.
If playing 100% by the book works for you, good for you.
Some people find that playing 85-95% by the book and the rest by feel works better for them.