david,
the problem with attempting to come up with objective standards for artforms is that our appreciation of artforms is subjective. continuing the analogy to hand position for pianists: while many who would like to see the cupped hand position be the standard, that would earn horowitz a big, fat F. let's look analogously at an activity where the results are objective - golf. there is nothing subjective about a golf score. so, what is to be the standard backswing length? tiger woods 3/4 swing or, john daly's round-house swing.
in my own teaching, i don't really concern myself with posture unless the student is doing something that gets in their way. i think posture is grossly overrated as a concern in singing. as i teach a wide variety of styles of singing, i feel it is more important for the student to understand the effect of larynx position on sound than it is to adopt a particular position (i do recognize that within a style, particularly one as rigid as classical singing, it is more likely one position will be most advantagious). even titze, a widely recognized voice scientist, is flexible on the subject of larynx position. as far as breathing is concerned, some people do better with their own screwed up method than they do attempting to do it correctly. while i generally prefer qigong breathing, again, if someone's own method is working for them, i don't interfere as i'm more interested in what they do with their breath rather than where or, how they take it.
while i, too, have seen students who are products of studios where the sound is the only thing that matters, get into trouble, eventually, i have also seen studios that produce a whole slew of singers who all look as if they just joined the same army. few are succesful while the rest work in bookstores for the rest of their lives, diligently honing their compulsory figures.
mike
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