Based on this quote, you've obviously gone beyond the newly-certified diver scenario and made a blanket statement across all skill levels during recreational dives. That is why you're getting such push back, but you keep repeating "for a new diver". That case has already been rebutted several times by the fact NEW divers are likely to be closer to their buddies so an air share IS a feasible (and preferred) course of action.
I wish you would stop asking such leading questions and putting words into people's mouths. The one-size fits all view you are pitching just doesn't fly with everyone. In SOME cases involving a new diver, I think most pro-pony respondents would say they would recommend a pony. In OTHER cases involving a new diver, they would not make such a recommendation.
With all the instructor credentials you cite, you should know that learning doesn't stop when you get your card in the mail. As has been pointed out, carrying a pony isn't rocket science. If someone dives in conditions where they would feel more comfortable not having to depend on their buddy, it's an easy solution.
Why are you assuming they have "less than adequate" training? Prior to the first time I carried a pony, I practiced deployment on land. That first dive with it, I also practiced deployment in a non-emergency situation. Ever after, I felt confident that tool was available to me.