My trimix training was with two agencies that were remarkably different in their beliefs about deep diving. Those differences would make wonderful discussions, IMO.
My cave training included thoughts that were also very different from some of my previous training. These differences, too, would be interesting.
Such discussions would indeed be appropriate in a T2T forum, but they don't happen here. I am not sure why, but I have an idea. I have seen some of these topics start to be discussed on a number of occasions in various forums, but the discussions don't go far because people who express a point of view that is fairly common in technical diving but runs counter to the thoughts of some people in this forum get shouted down quickly for their "obvious stupidity." It is hard to maintain a discussion in such an environment.
I recently started a thread in another forum related to the alterations in decompression schedules related to altitude. A topic like that would be good here, I would think. I prefaced my remarks by saying I was interested because of the fact that some of my friends had gotten bent while doing deco dives at altitude and had therefore started to research the topic in more depth. I was then contacted by a SB member representing the agency under whose direction those divers had been diving and told that because I did not also tell why he did not think those DCS cases were altitude-related, that sentence was unethical. He told me if I wrote another such sentence, he would report me to PADI (for whom I am an instructor) for disciplinary action.
Although that threat was absurd, that's the sort of attitude that discourages discussion.