It's true what you say about the happy parents, and probably you can't generalize to all kids. They are all different.
However, I also had a feeling that since the baby is totally dependent on me (he could not even turn on his belly in the first weeks), it was asked too much for him to entertain himself. Why do I get to decide what is enough for him (well fed and diapers cleaned has to be sufficient)? He could not even change his view without my help. This is just a very personal thing, though, everybody will feel different.
On a related note, I just read a book about sleep research and one experiment they did was exposing people to extreme boredom. That is they were made to lie in a bed for days and not even allowed to read or anything - so their situation is quite similar to those helpless babies. Turns out they would settle into a 4h sleep pattern, similar to babies.
I wouldn't say it is about boredom and entertainment, your kid is in the survival stage, fill basic needs, stay close to caregivers, etc. So, in fact, the crying had a function when we were apes in the Savannah, it was to call the mother in case she lost you. Now this need is deprecated, and the babie will have to be separated someday from parents, so letting cry for 5, then 10, then 20 minutes is a good compromise, imo better than teaching early your kid that whatever they want is easily obtained through loug crying.
Babies need more than just food and warm clothes. And they are dependent on you for a long time. I don't see the point in weaning them off things when they are still too young to provide them for themselves. For example, they can't just log on to Hacker News when they feel bored. Crying might be the equivalent to typing "news.ycombinator.com" into your URL bar. Is it really so bad to take care of your babies' needs?
However, I also had a feeling that since the baby is totally dependent on me (he could not even turn on his belly in the first weeks), it was asked too much for him to entertain himself. Why do I get to decide what is enough for him (well fed and diapers cleaned has to be sufficient)? He could not even change his view without my help. This is just a very personal thing, though, everybody will feel different.
On a related note, I just read a book about sleep research and one experiment they did was exposing people to extreme boredom. That is they were made to lie in a bed for days and not even allowed to read or anything - so their situation is quite similar to those helpless babies. Turns out they would settle into a 4h sleep pattern, similar to babies.