[xyzgolfAZ]

Amaverick: a wonderful post!
IMPACT-rehearsal is the chosen goal for a particular IMPACT condition for a resultant desired shot shape result!
Where you get to at TRANSITION means nothing (except to achieve enough angles for necessary acceleration on the forestroke), but being on the dynamic IMPACT-plane during IMPACT with the necessary clubFACE motion, clubHEAD path AND clubHEAD speed means everything to your shot results. However, certain TRANSITION positions are more compatible with certain chosen forestroke actions. There are many very sound golf stroke motions that produce great results with minimum compensations. Being mechanically perfect may be a goal, but being personally effective is all you should work toward. We all have personal physical limitations. However, Homer isolated many very correct conditions that one should consider.