By "wrist break" are you referring to the movement where the wrist is lifting up and hand and fingers kind of drop down to some degree? Then when the wrist is lowered the movement is reversed and the fingers become more aligned with the forearm.
I have noticed this movement in a large number of(perhaps most) pianists with varying degrees of height and frequency. I think Valentina Lisitsa does it with a very high movement of the wrist although it doesn't look unnatural to me(some posters have commented otherwise). In the first video on your blog, the pianist seems to make this movement so often that it looks somewhat bizarre(not necessarily meaning incorrect)to me. I am very familiar with Morozova's playing having heard her in around five solo recitals and 25 master classes. Her motions as shown in the video you psoted look more typical of a normal use of wrist break.
Here's a video with Koji Attwood using this motion on a somewhat smaller scale(if I am wrong about this, please correct me! I don't want to mischaracterize anyone's playing)in a performance of three of his particularly beautiful song transcriptions:http://www.youtube.com/watch?v=jk6ZiwFhd2w
Although I have noticed this motion in a large number of pianists, I don't know the idea behind it or why some think it's good or even required while others apparently think the opposite.
So I would be interested to hear other posters' opinions assuming we have agreed on what we mean by "wrist break."