BW,
I don’t recall reading where anyone “in” or “out” said these practices aren’t dangerous. I believe the points made regarding the hinge and slope were directed at that being a method to get a stem in a particular spot. Not the absence of danger.
About the only hands on training I have is my dad drilling into my head to never stand in the line of the bar - advice that likely saved my life 35 years ago when I was showing off. Does getting my face any where near a bar make me nervous, you bet it does.
As to one hand sawing, not only is NM a big dude, but the kickback hazard with a bar longer than the cut and with no obstacles is practically nil. Not that anyone should look to me as an example, but I frequently buck one handed when running a heavy long bar saw in the clear. Rarely if ever do I run a small or short bar saw that way. The risk of a torpedo I would hope has been assessed. Standing to the side likewise limits the risk of injury from that. Is it possible to always stand in the clear doubtful. Some do a better job at that than others. Same for looking up.
Does this make me in or out, I don’t know and I don’t really care.
Ron