A Complaint Free World

I am reading the book A Complaint Free World written by Will Bowen. This book is clear and easy to follow. So far, I only read the beginning 2 chapters and mostly agree with the author but to a small degree doubt exists in my mind.
I like to raise some questions to myself before I finish this book, and I hope I can find the answers before the end of the book.
How can a complaint free world exist and is it necessary to have a complaint free life? (or maybe I misunderstood the author's meaning.)
If we actually follow the steps to achieve a personal complaint free life, are there really nothing bothering us, or we just learn to ignore troubles and problems.
If we do learn to ignore problems, how can we actually solve the problems?
My thought is that if the problems are there, they will stay no matter we complain it or not.
And isn't it better if we complain and enhance the need to solve the problem?
Isn't it nice to hear friends' complaints to release his/her tension in life?
Is a complaint-free world too cold and people in that world too indifferent?
As I ask these questions, I feel the need to define the word "complain".
My thought is:
Complaint-free doesn't mean problem-free.
If complaining makes you happier and release the burden of your mental life, why not complain and speak out.
If complaint makes better changes, do complain.
If complaining makes your life worse and can not help solve the problems, then save it.

My thought might change after I finish the book.

A complaint free world doesn't sound perfect to me. In business world, complaints create opportunity for a new business to attract customers.
From political aspect, if there is no complaints, the government will not progress.

The thing I agree with the authors is:
If you don't like something, Change it. If you can't change it, change your attitude. ---by Maya Angelou
Complaint should happen infrequently; critique and gossip, never.
It is important to focus on what we want in our lives rather than putting our attention on what we don't want. Complaining is focusing on what we don't want. ---by the author of the book

I agree with the notion that complaining is focusing on something we don't want. That is why I think there is no need for a complaint free world.
However, if there is something we don't want or don't like, that means making changes will bring us better life. And complaint will attract changes. Of course, we don't want to focus our attention on "complaining"all the time, but we need to complain. Too much complaining would surely make our life miserable.
I feel myself is playing riddles. More pages to dwell on ~