It’s a trade off. Do you want to mollycoddle children into being total brats and snowflakes when they are grown? Or do you want them to be functioning human beings. Pure psychobabble. Who paid for this piece of tripe research?
It's a matter of degree, I would think. Everybody raises their voices at their kids from time to time.
But people who scream so as to intimidate or terrorize their kids often have other problems, such as low self esteem or alcohol abuse; this passes on disfunction to the kids.