I too used to be bugged by the meandering of posts, but now like Jo I realize that the posts are converstaions. Back on the BT spinal boards it really would get way off, and seemed to lose the question.
Here it really is not that bad, try going to some other boards and you will find there is none like this. Never really figured out why, but do know I fell inlove with everyone here because they agree to disagree sometimes. But always things work out, come together for good causes and many get helped.
It keeps everything lively and interesting to have the different opinions. I have learned a great deal in the 7 years I have been around.