Most people hang out on sn children topic. Plenty of support there? There have been many discussions over the years about the sn boards, but generally the privacy exists for specific reasons (general parenting advice not always relevant, and people not checking the sub-topics before piling in on parents seeking advice on how to toilet train older children/ behavioural issues etc) Sn teens has also been on/ off. In theory, I should transition to teens this year but tbh probably won't unless I have a specific issue. More traffic on kids.
And if people are asking for help on the regular boards, and it is obvious that they haven't found sn, they are always signposted to the right place and welcomed. Where are you seeing the lonely posts?