I'm not arguing against such a section (or even a whole forum like that). I just don't share your enthusiasm about it.
I've seen such attempts before elsewhere, and they didn't seem to work. There were either very few postings; or people were really mean to eachother, but claimed to be advanced; or the place was a pc hugbox.
I think that people who are so serious about the Dhamma that they are ready and able to discuss it in line with the criteria specified in the OP, do not post much in online forums, at all. Not because there would be something wrong with the forums, but because those people's priorities are so different that posting in online forums has a very low priority and isn't seen as something valuable.