Pierre,
As I stated before, the pinching Wireme's showed in his post is the old, obsolete method that had been replaced by the newer method of cutting back a little farther in the foliage.
Does pinching a few tips like this hurt anything? Not really. But, some practice this method exclusively and extensively. THAT's the problem.
Go see my thread "THIS is why not to pinch junipers". You'll see my photos of a tree that was pinched (sheared) everywhere. Granted, that's an extremely bad case.
Now, Vance is wrong that the method of no pinching is only 10 years old. No, its been used for decades. But, the INFORMATION has only recently been distributed. You see, its been done this way the bonsai professionals in Japan for decades, but here in the USA, it has remained relatively unknown.
Its in the Japanese magazines. I can't read the text, but I can see the pictures. I have some dated back in the 80's where it's depicted.
It's only been in the past 10 to 15 years that foreigners have been allowed to apprentice at the professional bonsai nurseries in Japan. And since then, the information is getting out. And the Internet helps spread the info faster.
The thing about books is the info contained a book is static. The printed pages can't get updated. So someone who picks up an old book is getting old information. Let's face it: John Naka's books, as wonderful as they are, are obsolete.
As I stated before, Brian and I are working with people who have shown at the very pinnacle of the art. They show us how it's done, and we're trying to share it, to elevate the art here.
Here are a couple pictures of what extensive pinching does:

