[bonyrek]

If i was to interpret the psychology behind it, I would say its because the men become completely slaved by the beauty of the women and thereby diverting attention to other important duties, or they get swayed by the false opinion or desires of such a women, or become less firm in his deen inorder to please the women. The relationship between men and women should be of a beautiful calm and sound nature and not of obsessive love and drugged nature.

And if the ttranslation provided is accurate word to word, then notice the word used is "less beautiful" and not "not beautiful". That would affirm my understanding that the statement is to avoid the fitnas the are associated with excessive beauty, as we see men who crave for such a women. That doesn't mean more beautiful women cannot marry, its just that each men has to marry a women of beauty relative to his own sound or fit standards.