I don't understand why people get so angry, these are guidelines, not a mandatory way of life.
I so wish I had all those advice for my first, my life would have been a lot happier. It works for all my others, apart from the swaddling. It's true that in most cases, if a baby eats enough during the day, he won't need to be fed at night. If a baby doesn't cry at night and sleep happily, as well as putting on weight, it means he doesn't need to be fed every 30mn.
It is also true, in most cases, that if a baby sleeps for hours during the day, he might not sleep so well at night.
You can parent as you please, no one is forcing you .I have tried and witnessed these advice overseas, and they work. You might believe it's bollocks, but other mums will benefit greatly from help. I can testify I tried these, and they work for me.