When you study many languages, like me, you find that every language has its own sweet spots. The experience of reading Pushkin in Russian seems to have no analogies in the whole English language and has resisted all attempts at translation. French postmodernist thought sounds great in French but (as a rule) turns to lousy and phony wordplay in other languages. And you never really get the point of Italian until you try singing in it, suddenly feeling the sounds come more naturally than in your language of birth, whatever it is.

It sounds to me as though this effect can be explained by things being lost in translation, which can happen to any language and is not indicative of a deep fundamental difference between languages. The true test of this theory would be to translate some English poetry into Russian and see if it comes out sounding deeper, or to translate some English postmodernism into French and see if it comes out sounding more authentic. It is actually believable that if you translate an English song into Italian that it will be more aesthetically pleasing - different languages have different patterns of sound, and some patterns of sound fit song better than others. But one rarely sings one's philosophy.