Natural languages, communication, etc

Okay.  We all know that German vowels are not "glidey" at all – the mouth
is in the same position for the duration of the vowel.  ITALIAN vowels,
on the other hand, glide all over the place –  consistently, of course.  
You also all know that things can only be made to "shatter" by being made
to vibrate at their own frequency.  now, think about this, and tell me
how much sense it makes.  Would non-native speakers of German find german
vowels more irritating because they contain much less change of frequency
– that is, one’s eardrum is made to vibrate at a rate much closer to its
own for much longer periods when listening to german speech?  Also, what
do you think about the corollary – because our diapragms and eardrums are
made of very similar materials, the fact that less is done to the
vibration in a German vowel makes the language as a whole (in opera,
conversation, but NOT writing) seem more "curt" and "clipped?"
please email responses – CC them to me if you feel it appropriate to post.