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As someone new to technical diving and someone who doesn't know its history, the term "extended range" makes sense to me. Tech diving extends the range of what's taught in OW and AOW. Calling it "technical diving" sets up "non-technical diving" as an alternative, which doesn't make much sense. All scuba diving seems technical by the dictionary definition.
The term "XR" as promoted by SSI and Mares does seem too proprietary.
I've chosen : other. Why ? Just find the whole bunch : tec, tek or even tech utterly stupid. Diving is nothing natural, it's a technical hobby in itself, even if you stay well within NDL. We use our rigs to extend your, very limited ability to progress and stay alive while submerged.
So what does the damned tech 'label' add to it ?
I would very much prefer complex diving, closer to the truth.