Heavy hitters like Daly, swing past the point the club becomes parallel to the ground.
This is because not only is the momentum of the club head at impact proportional to the amount
of force placed on the club through the grip, but also how long force is applied, so
theoretically a longer backswing is highly desirable.
The difficulty I have with your theory of turning the shoulders no more than ninety degrees and keeping the hips quiet,
is at least some of us are too inflexible to make that much of a shoulder turn without turning the hips to some degree,
although you seem to say some movement in the hips is not detrimental.
The condition of my body prohibits me from even making it to parallel, however I believe my problem
is "jerking" the club down at the top of the swing, this always happens when I over extend myself or
I keep my hips stationary. I can sometimes manage to be "laid off" at the top
and an incredible feeling of golf ataraxia ensues at the finish.