Strongo-
I don't know what they have against it either. One of my clients is a professional mountain biker; her PT didn't approve of our program of pull-ups, push-ups, and bb deadlifts. He claimed that the spine doesn't tolerate shear forces very well (which we know) and that she (my client) was asking for trouble. Regardless of the fact that her force production has doubled, and she feels great! It seems that often PT's for example, don't understand that a proper hinge loads the hams, glutes, and lats so much that the locked, extended lumbar spine is "spared" as McGill might say. This is one of several examples.
Another PT I met with claimed that squats in a traditional sense of deep hip and knee flexion causes the spine to rotate in the wrong direction causing problems. She couldn't articulate what she meant by this.
Again, what lessons can be learned from the conventional wisdom of clinicians combined with our knowledge of proper strength training in the simplest forms of resistance (bb's, kb's, calisthenics)?
BTW, I don't believe that movement theories between camps need to be mutually exclusive. I feel that there needs to be a seismic shift from an "us vs. them" banter.
R2