yes it is! Because the lumbopelvic junction is a very complex area comprised with a plethera of muscles, nerves, connective tissue, ligaments, muscles that are performing dynamic stability all the time!
It is soo vital as I indicated at the IDEA presentation last month, that understanding the anatomy, functional anatomy and biomechanics of this region is critically important!
Going back to your other point, the four horsemen(QL/external obliques/multifidi/Tva) I already commented on with your other comment are covered.
Paul Hodges, Diane Lee, Peter O’sullivan are the movers and shakers in physiotherapy in Australia
but we can forget Mr Vladamir Janda, MD whose extensive research pioneered the way to where
I really see how someone’s posture influences muscle imbalances–>leading to dysfunction.
McGill and others can not be forgotten but these individuals should be followed and reviewed in the discussions!