Newf,
Great post. Glad you brought this up, I actually thought about saying something on this myself.
My take is this. When it comes to fitness and nutrition, I tend not to listen to "arm chair" experts much. Don't get me wrong, the medical community has done wonders in their research and practices, as well as made miracles happen. However, I have always found that true fitness experts and even bodybuilders have been ahead of the ball when it comes to good information and knowledge of how the body works and responds to training and nutrition opposed to the medical community.
Most of my training career I have opted to follow the paths of those who have "walked the walk" before me and did so with success.
HOWEVER, on this topic that you present regarding spinal health, I have done a fair amount of research as well, and have found that some qualified experts who do "walk the walk" in the weight room themselves came to the same conclusions as your "expert."
So when I decided to become the full-time manager of a financial advising firm while being a personal trainer, going back to school for my masters in exercise science, became engaged, buy a house and 2 new cars, I became very worried about being locked into a new schedule of lifting when the doors unlock at my gym!
Part of me was saying, "Dude, you will kill yourself if you screw up your back and therefore your training." The other part of me was saying, "I will be damned if I am going to let some "experts" tell that I shouldn't, ESPECIALLY when I have seen many do it with success before me. Who are they to keep me out of the gym!"
Having no choice, I did it but with extreme caution! I get to the gym and do 20 minutes of extremely light cardio. It really is not even cardio, just slow jogging on a treadmill to get the blood going. I then perform very light weight, high rep movements in the weight room mimicking what I am about to train.
Also, when I first moved to AM training, I dropped my weight considerably in all exercises compared to what I was lifting in the past afternoons. I figured I would take my time with babysteps and if I ever experienced pain, I would stop. That pain never came and I eventually blew right past my goals of strength and size, so I am very happy and content that I followed my intuition.
For those of you who are in the same boat as I, I def. recommend using caution when starting out. However, if you do not experience pain, and can maintain good back/spine health, I say go for it.
Thanks for bringing this up Newf.