Although the importance of the left hemisphere cannot be diminished, Western society has become a sanctuary and temple to the rational man. To not also honor creative and holistic thinking would not simply be a mistake, it would be dangerous.
In a way I resent that the left brain is portrayed as a monotonous wasteland. Is there no potential to take the chaotic creative drive of the right, feed it back through the left, and arrive at improved understanding and insight through the organization of creative energy?
Rationality without creativity isn’t really rational at all, in that it results in a very proximate kind of practicality, while discarding rationality for the pretty colors and lack of limitations associated with creativity leaves one disconnected from reality.
Both sides are equally desirable and necessary, and representing one as inherently “better” than the other is short-sighted and idealistic.
(I realize the text addresses this in the first line; my commentary has more to do with the image itself)