Everyone has a right to come and go as they please of course. However I always find it a bit sad when people purposely delete their posts in the process. It always seems a little passive aggressive to me.
I used to be on another medical type forum and there was a time limit set on deletion and editing of posts. It was a generous amount, like maybe 7 days or something, but it stopped people from having a bit of a grumpy moment and deleting their posts, which as Hurdity pointed out, does disrupt the flow of a thread. When posts get deleted, or severely edited, it can really make a thread very hard to follow, particularly when in cases like Menomale, these posts contained a lot of linked information.
Anyway, maybe food for thought for Emma and Dr Currie to consider.