My thoughts exactly.
Except - if you 'magically' put a cross baffle in at, say the hip region, then each tube would then be shorter than a typical circumferential tube - 40" versus 55" for a quilt.
So it seems like a better arrangement, IF you can get that cross baffle in place.
The cross baffle certainly makes mass production harder, but posted elsewhere is the comment that Golite does this in their Ultra 20's.
But then I have to ask 'Since it is not done this way, what Are the reasons?' and hence this post.