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Not many warped but playable shafts are "thrown away" they are quite often replaced with new ones and become the second shaft with a "taper roll"
I have had excellent success taking an arch out of shafts over the years. I use the exact same principles. I don't put a flat spot in the length of the shaft or create a need for further servicing to repair any new damage.
It is the simplest most obvious concept on earth to bend it back opposite the warp in order to relieve the stress or stretch the fibers on the shortened side.
I don't think any one is saying it won't effectively do that job. I think the real question or cause of alarm is; Why drag a steel bar down a cue shaft to do the bending?, knowing full well that it will flatten the wood and probably scratch it as well? when it is simply not necessary.
Again, it's not weather the bending is effective, it's the abrasive method drawing attention to this particular method.