Hi Geoff, although I agree with you on your thoughts about the use of the Tq limiter for normal ops, I do think there is a place for it.
I was doing night rig training once where the candidate was too fast and too high on final and in spite of my constant guidance to control that, botched the approach so bad that I called for an overshoot. He grabbed such a mitful of collective that before I could react we had a momentary over torque. Luckily it was within limits so not a costly one. We were relatively light on fuel with just the 2 of us on board so there was no need for all that power to be available. I'm of the opinion that this might be a good use of the Tq limiter.