You didn't even read the article:
https://www.businessinsider.com/why-...-handed-2018-1
But the point is to demonstrate the fact that the preference for either hand has nothing to do with behavioral differences. The real explanation lies in the fact that a certain evolutionary course has decided the right-handed dominance in favor, by pure chance, for more efficiency and cooperation among humans.
So to seek explanations in "right-handed people and left-handed people are different, we must make distinctions between the two" is to miss the point (because there actually is no difference). The entire reason was purely coincidental and accidental. The real reason and the real explanation for why some people are right-handed and some left-handed, and why there were so few left-handed people, lied in the fact that the more social and more cooperative a species is, the more the general population will trend toward one side.