I can accept that idf someone feels that their training, experience and road skills reduce their risk then they achieve a similar reduction in risk.
A novice might benefit from HIViz, but they could also benefit from a whole range of other interventions.
I still stand that cycling should not and does not "need" specialist clothing.
That strikes me as a somewhat patronising view of novices but I have read similar comments elsewhere to the effect that Hi Viz = Novice. Frankly, I think it is nonsense which appears to just be based on a dislike of the aesthetics more than anything else.
I also think that it is naive to suggest that experience, road skills and training alone will be enough to save a cyclist from a driver who is not observing things as diligently as he should. Those things will, of course, help but road craft alone will not increase conspicuity as much as road craft + Hi Viz. To claim otherwise is simply ignoring the results of the very research that you were quoting earlier........an 8 times reduction in days of work amongst the wearers of Hi Viz.
I agree that cycling does not "need" specialist clothing. It doesn't need lycra, it doesn't "need" special shoes, jerseys, glasses, jerseys, jackets or gloves.....but they can all be useful. Funnily enough though, basic Hi viz is available for just a very few pounds.... far less than many on this site will spend on a jersey.
I stand by my view that Hi Viz has an important part to play in improving our safety. I would also argue, as you raised the subject earlier, that any properly conducted risk assessment by a cyclist would come to the conclusion that Hi Viz can only improve their safety. It is a "win-win" argument.
You are, of course, entitled to your view. My only concern is that others reading your comments may think that, if they wear Hi Viz, then they are identifying themselves as novices and are therefore not "real" cyclists. That is arrant nonsense.